ML20204G482
| ML20204G482 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 05/12/1983 |
| From: | Eisenhut D Office of Nuclear Reactor Regulation |
| To: | Vollmer R Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML17325B782 | List:
|
| References | |
| FOIA-84-741, FOIA-84-742 NUDOCS 8306010381 | |
| Download: ML20204G482 (2) | |
Text
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NUCLEAR REGULATORY COMMISSION e
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MAY 121333 k
l MEMORANDUM FOR:
Richard H. Vollmer Director l
Division of Engineering FROM:
Darrell G. Eisenhut, Director i
Division of Licensing i
SUBJECT:
DIABLO CANYON - REVIEW OF CCWS Over the past couple of months a number of questions have been raised concerning the adequacy of the design of the Diablo Canyon Component i
Cooling Water System.
The concerns were the subject of a Board Notifi-cation (see Enclosure 1).
Division of Systems Integration, particularly, Auxiliary Systems Branch has undertaken a review of the CCWS and are in the process of completing a SER.
PG&E was asked to provide additional verification of the design heat removal capability of the CCWS assuming the most limiting single failure with respect to CCWS performtnce (see Enclosure 2, question 2).
In PG&E's submittal, the limiting case that they determined would result in the l
highest peak CCW supply tempeaatures, is based on a maximum ocean water i
temperature of 64*F.
The FSAR was originally reviewed and approved by our staff for a maximum ocean water temperature of 70'F.
PG&E states that a 6F maximum ocean temperature is consistent with maximum recorded tempera.
L tures for the Diablo Canyoa site.
It is PG&E's opinion that a 64*F maximum ocean temperature is a conservative assumption for evaluation considering L
the low probability that a DBA LOCA would occur concurrent with an ocean te, pert.ture in excess of the highest recorded ocean temperature.
l The staff met with PG&E representatives on April 19, 1983 to discuss the
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design basis for the CCWS.
At this meeting, our Division of Licensing staff requested temperature records and analysis of recirculation effects to support l
a maximum ocean water temperature of 64'F.
PG&E has informed us that a basis for 64*F ocean temperature, including data and discussion of recircy-lation between ocean water intake and outlet, will be supplied to the NRC l
on May 16, 1983.
In order for Auxiliary Systems Branch to complete their review of the CCWS and issue a SER, we have determined that Environmental and Hydrologic Engineering Branch should review the basis for a 64*F maximum ocean water I
tempe'ature.
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Auxiliary Systems Branch has informed me that if they are provided with results of your review by June 6, 1983, they will be able to provide SER inputs to DL by June 10, 1983.
If you are unable to support this schedule, please notify me promptly.
DL will arrange teleconferences or meetings as needed to support your efforts.
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Darrell G. EIsenhut, Director Division of Licensing Office of fluclear Reactor Regulation Enciosures:
As stated 1
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H. R. Denton l
E. G. Case R. l'attson T. M. flovak G. 1. Knighton
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50-523 MEMORANDUM FOR:
Chairman Palladino Co:miissioner Gilinsky Comissioner Ahearne Cc missioner Roberts Cor:missioner Asselstine F F.0M:
Oarr. ell G. Eisenhut, Director Division of Licensing Office of !!uclear F.aactor F.egu'.ation SL5 JECT:
INF0?.MATION ITEM - NOTIFICATIC.', CF SEISMIC
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QUALIFICAiiG'i ALLEGATIONS AT 0:A!'0 CANYON (5 card Notification No. 82-03)
In accordance with NRC procedure for beard notification the folle.<ing
'.nferr.ation is being transmitted directly to the C:--issi:n.
The staff has recently received allegations c:n:tr 'r; te. tral safety de' icier:tes at the :iabic Cany:n pr:.'ect.
The 1:1:ed :
- n-s relate to:
design ascects of the c:.;,r.ent cooiing. t ar system, a.
in:iuding its seismic classification, sin;:e failure c:.s'.daratiens and its heat re : val ca:st ties. and vart:cs ether consideratiens including 'L: des' b.
classif t:stions ap;rcaches, design a;pr:a:.es us;r./
ed for seismic Class 1 and Class II interfaces, and the seismic design of diesel generator ir.tti.es and exhausts.
The alleger has expressly requested and ns assurec of ancnymity to the extent permitted by law.
7.esiew cf the allegations by NF.R. F.e;icn V and !! 'as c:- enced cn the tasis cf detatied information ;r:vidad by the a'.'.e;tr.
Se alit;ati:ns have petential bearing en the curra ti.s :r.;:in;.trifter.tien efforts cf b:th PGIE/5echtel and the !nde;cndent :esi;r '/arification Frc; ram.
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> MEMORANDUM FOR:
Darrell G. Eisenhut, Director, Division of Licensing, NRR FROM:
Roger J. Mattson, Director Division of Systems Integration, fiRR
SUBJECT:
DIABLO CANYON - REVIEW 0F COMPONENT COOLING WATER SYSTEM As requested in your February 18, 1983 memorandum, DSI will provide a Safety Evaluation Report (SER) input concerning the design adequacy of the Diablo Canyon component cooling water system (CCWS) by March 31, 1983.
The SER input will address the four concerns identified in your memorandum.
We do not anticipate the need for any further meetings or site visits relating to this issue at this time.
However, we request that DL expedite responses from PGLE te the requests for additional documentation which the applicant com.mitted to provide during the January 28, 1983 meeting.
These are as follows:
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1.
Additional discussion and engineering justification for the maximum assumed '
leak rate of 200 gpm from the nonseismically qualified components in the "Cd loop of the CCWS following an SSE.
(
Reference:
January 28, 1983 meeting transcript at 101).
2.
Additional verification of the design heat removal capability of the CCWS in the various accident operating modes including operator actions required, and assuming the most limiting single failure with respect to CCWS perfor-mance.
This reevaluation is also to include a cem;:arison against the FSAR te paratures and assumptions for heat removal, and should provide verifica-tion of the capability of each CCW heat exchanger to handle full flow from all CCW pumes.
(
Reference:
January 28, 1933 meeting transcript at 69 through79).
A::itional ciscussion with the applicant may be ne:essary follcwing cur review of the responses to the above concerns.
This may be handled by telephone calls as necessary.
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,.. Roger J. Mattson, Director
' Division of Systems Integration cc:
H. Denton
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