ANS publishes revised standard on PWR reload startup physics tests

February 25, 2020, 2:43PMANS News

The ANS Standards Committee has just published ANSI/ANS-19.6.1-2019, “Reload Startup Physics Tests for Pressurized Water Reactors” (revision of ANS-19.6.1-2011). The standard, approved December 19, 2019, provides guidance for verifying the nuclear characteristics of a commercial pressurized water reactor core following a refueling or other alteration of the reactor core for which nuclear design calculations are required. The standard provides the minimum acceptable startup physics test program, while recognizing that additional tests may be required by special design features of a particular core.

This 2019 revision of the standard moves discussion of the difference between review criteria and acceptance criteria from the appendix to the body of the standard, incorporates clarification on testing at the next power plateau, and includes other editorial changes. This standard does not reflect all test programs that have been approved by the U.S. Nuclear Regulatory Commission.

All ANS standards, including ANSI/ANS-19.6.1-2019, are available for purchase in the ANS Standards Store at

Related Articles

The PRA standard for advanced non-LWRs

April 23, 2021, 2:55PMNuclear NewsKarl Fleming

The ASME/ANS Joint Committee on Nuclear Risk Management (JCNRM) has achieved a significant milestone in the advancement of probabilistic risk assessment (PRA) technology. ANSI/ASME/ANS...

Post-Fukushima safety enhancements

ANS flooding and seismic consensus standards assist the NRC and DOE in buttressing nuclear facility safety policies

April 2, 2021, 2:47PMNuclear NewsLeah Parks, Carl Mazzola, Jim Xu, and Brent Gutierrez

March 11 will mark the 10-­year anniversary of the Fukushima Daiichi event, when a 45-­foot tsunami, caused by the 9.0-­magnitude Great Tohoku Earthquake, significantly damaged the reactors...

YMG’s new Rad Talks series gets under way

August 3, 2020, 3:23PMANS News

The ANS Young Members Group is launching a new series of virtual events called Rad Talks. Inspired by the concept of salon dinners, each Rad Talks session will spotlight an influential nuclear...

Spotlighting teamwork and new ideas at LLNL

July 20, 2020, 11:42AMANS News

The sixth and most recent installment in the ANS Young Members Group (YMG) Spotlight on National Labs webinar series explored nuclear science and engineering at Lawrence Livermore National...

Risk-informed, performance-based safety: Past, present, and future

Risk-informed and performance-based approaches to nuclear safety have saved money and improved safety for current reactors and have the potential to offer even greater benefits for advanced reactors.

June 26, 2020, 3:05PMNuclear NewsN. Prasad Kadambi, Edward Wallace, James O’Brien, and Robert Youngblood

Since the 1980s, the nuclear power industry in the United States has worked to enhance the regulatory framework for nuclear facilities by making it more risk-informed and performance-based...