PNO-V-82-009, util Notified Region V of Plans to Make Written Notification to ASLB Re Apparent Lack of Proper Seismic Qualification of Pressurizer Relief Valves & Associated Piping
| ML20041C800 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 02/24/1982 |
| From: | Crews J, Morrill P NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| To: | |
| References | |
| PNO-V-82-009, PNO-V-82-9, NUDOCS 8203020570 | |
| Download: ML20041C800 (1) | |
PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-V-82-09 DATE: 2/
8 This preliminary notification constitutes EARLY notice of events of POSSIBLE safety or public interest significance. The information is as initially received without verification or evaluation, and is basically all that is known by IE staff on this date.
Facility: Pacific Gas & Electric Co. (PG&E)
~ Licensee Emergency Classification:
Diablo Canyon thit No.1 Notification of Unusual Event
. Docket No. 50-275 Alert San Luis Obispo County, California Site Area Emergency
Subject:
SEISMIC QUALIFICATION OF g
gt p1 ab PRESSURIZER RELIEF, PORV AND PORV BLOCKING VALVES The licensee notified NRC Region V (San Francisco) of plans to make written notification to the Atomic Safety and Licensing Board (ASLB) in the Diablo Canyon proceeding regarding the apparent lack of proper seismic qualification of the pressurizer relief, PORV and PORV Blocking valves as well as associated piping.
According to PG&E, the subject valves and associated piping were seismically qualified using seismic design spectra of the containment building operating floor (elevation 140 feet), whereas the valves are located at the top of the pressurizer vessel between elevations 170 feet and 180 feet.
Specific analyses to determine the significance of this finding is currently in progress by PG&E.
The ASLB notification is being made in this instance because these valves and their qualification were the subject of specific issue in the recently completed ASLB puolic hearing.
Media interest is expected.
NRC Region V (San Francisco) received notification of this occurrence from an NRC Region V inspector at PG&E's offices in San Francisco at 2:50 p.m. PST on February 24, 1982.
This information is current as of that time.
CONTACT:
P. J. Morrill, 463-3740 or J. L. Crew 63-735 y e l r q, N
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6 F203020570 020224 PDR I&E i
PNO-V-82-OO9 PD,R
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