ML20106A019

Followup Ro:Determined That Exhaust Dampers in EOF Ventilation Sys Not Installed as Required During Testing Per NRC Info Notice 92-032.Caused by Air Inleakage Above Acceptable Levels.Physical Mods Will Be Completed by 921215

ML20106A019
Person / Time
Site:	San Onofre
Issue date:	09/11/1992
From:	Rosenblum R SOUTHERN CALIFORNIA EDISON CO.
To:	Martin J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
IEIN-92-032, IEIN-92-32, NUDOCS 9209250101
Download: ML20106A019 (2)

Text

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mm . . . .m.m . m,w . , m.,* September 11, 1992 John B. Martin Regional Administrator U. S. Nuclear Regulatory Commission, Region V 1450 Maria Lane, Suite 210 '

Walnut Creek, CA 94596 Gentlemen:

Subject:

Docket No. 50-362 Emergency Operations facility (EOF) Ventilation System San Onofre Nuclear Generating Station, Unit 3

References:

1. Letter, K. P. Baskin, SCE, to D. G. Eisenhut, NRC, (EOF)

Ventilation System, Docket Nos. 50-206, 50-361 and 50-362, July 22, 1983, i i

2. Letter, M. O. Medford, SCE, to D. G. Eisenhut, NRC, (EOF) l Ventilation System, Docket Nos. 50-206, 50-361 and 50-362, ,

January 9, 1984.

Pursuant to the San Onofre Nuclear Generating Station, Unit 3 Facility Operating License NPF-15, License Condition 2.G, this letter constitutes the 14 day follow-up written report of an apparent violation of Unit 3 Full Power LicenseCondition2.C(24). Specifically we have determined that exhaust isolation dampers in the Emergency Operations facility (EOF) ventilation system were not installed as required. 1his condition was reported to Region V by phone on August 28, 1992, by Walter C. Maish, Assistant Manager, Nuclear Regulatory Aff airs. Due to an administrative oversight during the preparation of this re) ort, the 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> written follow-up to the telephone notification was not suamitted. ,

jlackaround 1he San Onof re Unit 3 Low Nar License NPF-15 was issued on November 15, 1982. License Condition 2 t.(17)(j) stated that "...the upgraded emergency support facilities shall be operational." In Reference 1, we further stated thet "...SCE has reviewed the E0F ventilation system design. As a result of the review, SCE has concluded that certain modifications are necessary to assure that the EOF ventilation system can be isolated. The modifications involve the installation of isolation dampers on all llVAC penetrations into the EOF." Upon issuance of the full Power License on September 16, 1983 ,

9209250101 920911 D

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John B. Martin License Condition No. 2.C(24) was added to the facility Operating License.

This stated "By January 1,1984 the primary EOF ventilation system shall be modified to provide isolatit i capability as described in the SCE letter of July 22, 1983." In Reference 2, we informed the NRC that the E0F HVAC system had been modified by installing "... dampers on the penetrations for the EOF HVAC, (and) on the exhaust duct work for the EOF HVAC."

During testing performed in August of 1992 in response to IE Notice 92-32, it was found that EOF air inleakage was above acceptable levels. Physical inspections of the EOF HVAC ductwork concluded on August 28 that the EOF liVAC isolation dampers were apparently installed only on the inlet side of the EOF HVAC system. We have been unable to establish, due to the length of time and lack of documentation since the modifications were made in 1983, tha reason why isolation damacrs were not also installed, as originally planned, on the I exhaust side of t1e EOF HVAC system.

Cortective Actions SCE will install isolation dampers on the exhaust side of the E0F HVAC system and make any other appropriate changes. These physical modifications will be completed by December 15, 1992. SCE maintains an alternate EOF which will be utilized in the event the primary EOF is rendered uninhabitable. Emergency Plan Implementing Procedures (EPIP) contain guidance for relocating to the alternate EOF. Training on this process was provided to E0F emergency -

t response personnel.

Although we believe that this was an isolated installation error, wc m conducting a special review of our commitments regarding the EOF. After we have compiled our EOF commitment listing, we will reverify completion of the -

commitments, if any additional discrepancies are discovered, we will provide supplemental reports as appropriate.

If there are any questions, please call me.

Sincerely, '

NYDNh %

kr2All cc: Document: Control Desk, NRC C. W. Caldwell, NRC Senior Resident inspector, San Onofre Units 1, 2&3 H. B. Fields, NRC Project Manager, San Onofre Units 2 & 3

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