ML20127K678

RO:730926,discovered That Low Pressure Core Cooling Sys & Containment Cooling Svc Water Sys Inoperable Per TS 405.G.1. DG Starting Sys Maintenance Procedure Will Be Revised to Assure Compliance W/Ts Requirements

ML20127K678
Person / Time
Site:	Monticello
Issue date:	10/05/1973
From:	Mayer L NORTHERN STATES POWER CO.
To:	Oleary J US ATOMIC ENERGY COMMISSION (AEC)
References
NUDOCS 9211200469
Download: ML20127K678 (2)

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NSR2 /K NORTHERN STATES POWER COMPANY M I N N E A P O L.l e. M I N N E S OTA 88401 i

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C g\ b N OCT 9 1973 - 1 ,

Mr. J F O' Leary, Director Directorate of Licensing REGUwon M L SECD04

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F Office of Regulation U S Atomic Energy Commission y

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Dear Mr. O' Leary:

,y MONTICELLO NUCLEAR GENERATING PIANT Docket No. 50-263 License No. DPR-22 Inadvertent Omission of Required Surveillance Test A condition occurred at the Monticello Nuclear Generating Plant which we are reporting to your office in accordance with Section 6.7.B.1, Abnormal Occurrence Reports, of Appendix A, Technical Specifications, of Provisional Operating License DPR-22.

On September 26, 1973 it was discovered that when scheduled starting system )

preventive maintenance had been perfomed for No.11 diesel generator on  !

September 24, 1973, and for No. 12 diesel generator on September 25, 1973, the low pressure core cooling systems and containment cooling service water systems were not demonstrated to be operable as required by Technical Specification 4.5.G.I.

The maincenance had been performed in accordance with established administra-tive methods which include reviews of prerequisite requirements by three members of plant management prior to commencement of the work. A detemina-tion of surveillance test requirements of the Technical Specifications is included in such reviews. The requirement for demonstrating the operability of the redundant diesel generator, in accordance with Technical Specification 3.9.B.3.a. had been identified. However, the individuals involved in this instance did not recognize the omission of the requirements of Technical Specification 4.5.G.I.

A memo has been issued to remind the shif t aspervisors of the tests required by Technical Specification 4.5.G.I. Also, the diesel generator starting system maintenance procedure will be revised to assure compliance with all Technical Specification requirements.

9211200469 731005 PDR S

ADOCK 05000263 PDR 7453

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i NORT[ IN OTATED POWER COMI NY  ;

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! Imediately prior to the maintenance work on each diesci generator, the j redundant unit had been demonstrated to be operable in accordance with

• Technical Specification 3.9.B.3.a. All low pressure core cooling and con-i tainment cooling service water systems had been demonstrated to be operable on September 3, 1973, and September 10, 1973, respectively. 'Ihe low pres-J sure core cooling systems were again demonstrated to be operable on October ,

2, 1973. Therefore, there is reasonable assurance that the low pressure core cooling and containment cooling service water systems connected to the 4

redundant diesel generator were operable during the time that each diesel i

generator was inoperable.

.l It is believed that the corrective actions taken are sufficient to prevent i

a repetition of this particular occurrence. Existing administrative methods, procedures and training programs are designed to prevent similar 1 occurrences.

Yours very truly, I . O. '

L 0 Mayer, PE Director of Nuclear Support Services i

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i cc: J G Keppler i G Charnoff i Minnesota Pollution Control Ageney ,

! Attu Ken Dzugan 4

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