ML20086J192

AO 74-29:on 741125,HPCI Isolated Following Automatic Initiation.Cause Unknown.Corrective Actions to Be Determined After Testing

ML20086J192
Person / Time
Site:	Peach Bottom
Issue date:	12/05/1974
From:	Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	Giambusso A US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20086J196	List: ML20086J192 ML20086J197
References
AO-74-29, NUDOCS 8401230292
Download: ML20086J192 (2)

Text

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PHILADELPHIA ELECTRIC COMPANY  ;

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2301 MARKET STREET PHILADELPHIA, PA.19101 ', !k]

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December 5,1974 if(lA M

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Mr. A. Giambusso '/ 7s ,' ' ,,

Deputy Director of Reactor Projects "

United States Atomic Energy Commission Directorate of Licensing Washington, DC 20545

Subject:

Abnormal Occurrence The folicwing occurrence was reported to Mr. Walt Baunack, A.E.C. Region 1 Regulatory Operations Office on November 25, 1974.

Written notification was made to Mr. James P. O'Reilly, Region i Regulatory Operations Office on November 25, 1974. In accordance with Section 6.7.2.A of the Technical Specifications, Appendix A of DPR-56 for Unit 3 Peach Bottom Atomic Power Station, the following re-port is being submitted to the Directorate of Licensing as an Abnormal Occurrence.

Reference:

License Number DPR-56 Technical Specification Reference 3 5.C Report No.: 50-278-74-29 Report Date: December 5, 1974 .

Occurrence Date: November 25, 1974 Facility: Peach Bottom Atomic Power Station R.D. 1, Delta, Pennsylvania 17314 Identification of Occurrence:

• HPCI isolation following automatic initiation.-

Conditions Prior . to Occurrence:

Unit 3 reactor-isolated and scrammed as part nf a startup test program.

Description of Occurrence:

During the review of data taken during the 100% reactor isolation test performed on 11/19/74, it was noted that the HPCI had isolated after receiving an initiation signal during the. transient. The unit'was 3 n"

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t Mr. A. Giambusso December 5, 1974 Page 2 immediately reset and operated to inject water into the reactor.

Designation of Apparent Cause of Occurrence:

A review of the test data and interviews with the operators present during the transient has not provided on absolute cause.

Analysis of Occurrence:

During this transient, the reactor water level momentarily dropped to the initiation icvel for HPCI and RCIC. Reactor watcr level was immediately recovered by way of the reactor feedpump. HPCI opera-tion was not required during this transient. All~other engineered safeguard systems operated as expected. This occurrence has minimal safety implications.

Corrective Action:

In an attempt to further investigate and determine the exact cause of this occurrence, a HPCI quick start with a condensate storage tank to condensate storage flow path was performed on 11/27/74. During this test, MPCI stop valve movement, control valve movement, high steam line flow /4p indication, speed, flow and discharge head were monitored.

All parameters moni tored were satisf actory and no HPCI system isolation occurred. A vessel injection test will be repeated prior to completion of a 1004 testing program to further ensure HPCI operability.

Failure Data:

None.

Very truly yours,

, d ,

,M.pJ. [;Cooney

[ l- :n c y jj Ass t Gen' t St:perintendent Generation Division

• cc: Mr. J. P. O'Reilly

, Director, Region 1 l

United States Atomic Energy Commission 631 Park Avenue King of Prussia, PA 19406

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