ML18285A152

/12/18 E-mail from M. Whitlock to R.Guzman MPS2 Relief Request V-01, Update to MPS2 Inservice Testing Plan

ML18285A152
Person / Time
Site:	Millstone
Issue date:	10/12/2018
From:	Whitlock M Dominion Energy Nuclear Connecticut
To:	Richard Guzman Plant Licensing Branch 1
Guzman R
References
EPID L-2018-LLR-0014
Download: ML18285A152 (2)

Text

From: Michael L Whitlock <michael.l.whitlock@dominionenergy.com>

Sent: Friday, October 12, 2018 10:48 AM To: Guzman, Richard Cc: Shayan Sinha

Subject:

[External_Sender] RE: MPS2Relief Request V-01

Rich, The Dominion IST staff agrees with NRCs observation that MPS2 valves 2-CS-050 and 2-CS-051 should be reclassified as Category B valves. Therefore, Dominion will update the MPS2 IST plan accordingly to reflect this change.

Michael Whitlock Nuclear Regulatory Affairs Dominion Energy Services, Inc.

o - 804-273-3123 From: Guzman, Richard [1]

Sent: Friday, September 14, 2018 11:41 AM To: Michael L Whitlock (Generation - 6)

Subject:

[External] MPS2Relief Request V-01

Mike, As discussed, for the subject relief request, ASME OM Code ISTC-3630(a) requires leakage testing of Category A valves, other than containment isolation valves, on a 2-year frequency.

DENC is proposing 8 valves whose closing function prevents back-leakage to the RWST during the recirc phase of a LOCA to have extended testing frequencies. V-01 states that:

2-CS-050 and 2-CS-051 are two parallel valves in series with 2-SI-459. 2-SI-459 would be the valve in the path normally tested every 60 months, with the ability to test 2-CS-050 and 2-CS-051 maintained as an alternative.

The staff notes that this aspect of the alternative is new compared to the previous alternatives for prior intervals as both valves were historically tested in lieu of testing 2-SI-459. The staff has the understanding that 2-CS-050 and 2-CS-051 should therefore be downgraded to Category B (in lieu of Category A) valves, and the Program Plan should be updated accordingly. Please confirm with your team to see if this checks with them, and if these valves will be made Cat B. We can have a call next week w/the NRR technical staff (Michael Farnan and Aaron Mink), if needed to discuss further.

Thanks, Rich

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Rich Guzman Sr. PM, Division Operator Reactor Licensing Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Office: O-9C7 l Phone: (301) 415-1030 Richard.Guzman@nrc.gov CONFIDENTIALITY NOTICE: This electronic message contains information which may be legally confidential and or privileged and does not in any case represent a firm ENERGY COMMODITY bid or offer relating thereto which binds the sender without an additional express written confirmation to that effect. The information is intended solely for the individual or entity named above and access by anyone else is unauthorized. If you are not the intended recipient, any disclosure, copying, distribution, or use of the contents of this information is prohibited and may be unlawful. If you have received this electronic transmission in error, please reply immediately to the sender that you have received the message in error, and delete it. Thank you.