ML20098F961
| ML20098F961 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 10/01/1984 |
| From: | Locke R PACIFIC GAS & ELECTRIC CO. |
| To: | NRC OFFICE OF THE SECRETARY (SECY) |
| References | |
| CON-#484-247 OL, NUDOCS 8410030588 | |
| Download: ML20098F961 (3) | |
Text
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,th PACIFIC GAS AND E LE C T RIC Q PANY 77 BE ALE STREET, S AN FR ANCISCO, C ALIFORNI A 94106 TELEPHONE (415) 541 6614 3
P. O. B O X 744 2, S AN FRANCISCO, CALIFORNI A 94120 T
COP ER (415) 543 7813 RICHARD P. LOCKE ATTORNEY AT LAW LFfiCE D' H C M,
00CHETiNti & SER e n:
October 1, 1984 ERANCH VIA EXPRESS MAIL Secretary U. S. Nuclear Regulatory Commission Washington, D.C.
20555 Attention:
Docketing and I
Service Section Re:
In the Matter of Pacific Gas and Electric Company (Diablo j
Canyon Power Plant Units 1 and 2)) (
Docket Nos. 50-275 and 50-323
[
i
Dear Sir:
I l
In Pacific Gas and Electric Company's Response to the Appeal Board's Order of September 10, 1984, filed on September 28, 1984, we inadvertently omitted Exhibit A to the Connell-Valhstrom affidavit.
A copy of that Exhibit
(-
the NRC) is enclosed.
We regret any inconvenience this oversight may have caused.
Very truly yours, l
fV l
I RFL:sls cc:
Diablo Canyon Service List Enclosures 8410030588 841001 PDR ADOCK 05000275 O
PDR l
I
n P.A.C I F I C OAS AND E LE C T RIC C O M PANY E D WE;At l
77 BEALE STREET. SAN FRANC 15CO. C ALIFORNIA 94106. (415)781 4211. Twx 9:0 372 6587
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PGandE Letter No.: DCL-84-137 Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Consnission Washington, D.C.
20555 Re: Docket No. 50-275, DL-DPR-76 Diablo Canyon Unit 1 Jet Impingement Evaluations
Dear Mr. Denton:
In the Atomic Safety and Licensing Appeal Board decision dated March 20, 1984 (ALAB-763), the Board ruled (pp. 67 and 68) that PGandE must perform jet impingement evaluations for three lines inside containment that were not included within the scope of the pressure / temperature criteria PGandE used for identifying lines for analysis.
The enclosure to this letter identifies those lines and provides the results of PGandE's analysis of the lines with respect to jet impingement. No modifications resulted from this analysis.
Kindly acknowledge receipt of this material on the enclosed copy of this letter and return it in the enclosed addressed envelope.
Sincerely, Enclosure cc:
D. G. Eisenhut G. W. Knighton J. B. Martin H. E. Schierling Service List EXHIBIT A TO ATTACHMENT 4
4 PGan Letter No.: DCL-84-137 ENCLOSURE ADDITIONAL LINES CON 5IDERED FOR JET IRINGEENT The Diablo Canyon Project's reverification of the effects of jet impingement inside containment originally considered as jet impingement sources those lines with a pressure greater than 275 psi and a temperature greater than 2000F, which also met the size and usage critaria of the Standard Review Plan. Since the original reverification, the scope has been expanded to include, as sources, those lines with pressure greater than 275 psi or temperature greater than 2000F, which also meet the size and usage criteria. It was shown that only three lines or classes of lines would be affected:
1.
The charging line from the containment penetration to the regenerative heat exchanger; 2.
The reactor coolant pump seal injection lines; and 3.
The accumulater injection lines upstream of the check valves The first two classes of lines cannot produce a jet even if the lines are assumed to rupture because there is no high energy reservoir to provide a driving head. In the forward flow direction, both lines depend on the positive displacement charging pump to provide pressure. This pressure will immediately drop if the line is ruptured. Reverse flow is (1) prevented by redundant check valves for the first case, or (2) greatly restricted by the reactor coolant pump seals such that the pressure is less than 50 psi for the second case. This was discussed with the NRC Staff in a meeting in October 1983.
A~ rupture in the accumulator injection lines could produce a jet.
Accordingly, these lines were added to the jet impingement walkdown and reviewed. As expected, due to the layout of these lines, there are no unacceptable consequences from the hypothetical rupture of these lines. This wa:: documented, along with the disposition for all other high energy lines, in PGandE Letter No. DCL-84-041, dated February 6,1984, to the NRC.
l 0834d/0009K EXHIBIT A TO ATTACHMENT 4
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