ML19276H414
| ML19276H414 | |
| Person / Time | |
|---|---|
| Site: | Trojan File:Portland General Electric icon.png |
| Issue date: | 08/31/1979 |
| From: | Christensen S, Goodwin C, Lentsch J PORTLAND GENERAL ELECTRIC CO. |
| To: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| Shared Package | |
| ML19276H411 | List: |
| References | |
| NUDOCS 7910220254 | |
| Download: ML19276H414 (2) | |
Text
R. C. Farley (Bechtel) - ATT;;:
L. Dccon, L. Cunn ng a: (3),
L. Weislogel (PP&L), D. Axtell (EWEB), R. 1;yland (BPA),
M. Axelrad, Reading File. C. Tra-ell, LIS, TNP:
r-, Po:tand Gans c! Elechic Company
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Chades Goccwr # Assta-t V.ce Pescet August 31, 1979 Trojan Nuclear Plant Docket SC-344 License NPF-1 Mr. R. H. Engelken, Director lear Regulatory Cc ission Suite 202, Walnut Creek Plaza gggg' O P '
1990 N. California Blvd.
s~d M u Walnut Creek, CA 94596
Dear Sir:
By lE Bulletin 79-14, dated July 2, revised July 18, and supple =ented August 15, 1979, PGE was advised of difficulties at other plants related to the accuracy of input information for seis=ic analysis of safety-related piping systems and was requested to verify that analytical input data confor:s to installed system configuraticas at Trejan.
PGE is verifying seis=ic analysis input data by first confir=ing that as-built drawings properly reflect field installation and, second, by confir=-
ing that data on these as-built drawings has been properly reflected as input into th'e seis:1c analysis.
System walkdewns have been eo=pleted fer.all accessible nonredundant and one train of the redundant systems at Trojan. The results to date, presented in our attached 60-day report, confir: that as-built drawings of safety-related syste=s at Trojan properly reflect cetual field install-ation. Two nonconfornance reports, one of which does not apply to this Bulletin and the other not affecting syste= operability, have been issued during the current syste= valkdevns.
This small number of nonconfor:ances is due largely to extensive confir=atory work pr eviously conducted at Trojan. This confir:atory work, outlined in submittals to the NRC, dated July 27, 1979 and August 1, 1979, included extensive "as-built" confir=a-tien walkdcwns and investigations which verified that plant documentation reflected actual field design.
The effort to confir= that as-built data has been properly input into the seis ic analysis has not been cc:pleted. To date, apprcxicately 30 per-cent of the corresponding seismic analysis input data for accessible nenredundant and one train of the redundant systs:s has been rechecked by Bechtel~Pcwer Corporation. To date,' data verification has uncovered enly cinor descrepancies. We have found no conditien which affects systc: cperability.
7 910220 L 5 Y w s :: es c-sw =ces-= c er-m
Pordaad Gena.t Elamic Com;ntry Q}
R. H. Engelken i
Page 2 Mgh M(MNSJ 2y b
August 31, 1979 m
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In conclusion, cc:pliance with the intent of the field inspection require-cents of Eulletin Ite: 3 has been achieved by investigations described in the above centioned submittals and by the inspection outlined in the 60-day report,.
There is a high degree of assurance that potentially significant nonconfor:ances to design docu:ents, as described in IE Eul-letin 79-14, do not exist at the Trojan Nuclear Plant. Consequently, as indicated in our letter of August 1, 1979, PCI does not plan to conduct the 120-day field inspaccion unless otherei:e instructed.
Con-fir =ation that the as-built field data has been prcperly input into the seis=ic analysis is continuing and will be addrested in a supplemental report by Septenber 28, 1979.
If the results of the data input confirza-tion effort continues to be as faverable as has been experienced to date, PCE will not plan t'o conduct a data verification of the remaining syste=s.
Should the NRC decide, after reviewing this report that Trejan should perform the 120-day field inspection, we request that the inspection be deferred until our next refueling which is scheduled for early next year.
Trojan is essential to =eeting our load requirements due to a current significant shortage of energy ir the Pacific Northwest since lack of rainfall has reduced hydro electric resources.
Deferring the shutdown portion of the inspection until the refueling outage would i= prove the probability of preventing electrical power shortages until reservoirs in the area have had an opportunity to return to nor=al levels.
Sincerely,,
C. Goodwin, Jr.
Assistant Vice President Ther=al Plant Operation and Maintenance 121
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Attach ent
'J. W. Lentsch c: Director
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N S. R. C! ris tensen Director Nuclear Reactor Regulation ATTN:
Mr. A. Schwencer Mr. Lynn Frank, Director State of Cregon Ocpartzent of Energy
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