ML20084U150

AO 50-265/75-13:on 750418,during ECCS Simulated Automatic Actuation Surveillance Test,Core Spray Pump 2B Auto Start Failed.Caused by Loose Terminal Connection on Control Panel 902-33.Connection Tightened

ML20084U150
Person / Time
Site:	Quad Cities
Issue date:	04/28/1975
From:	Kalivianakis N COMMONWEALTH EDISON CO.
To:	Oleary J Office of Nuclear Reactor Regulation
Shared Package
ML20084U154	List: ML20084U150 ML20084U155
References
AO-50-265-75-13, NJK-75-225, NUDOCS 8306270073
Download: ML20084U150 (3)

Text

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Ouad-C>~c,s Generating Station.

3 Post Office Box 216 i Yj Cordova. imnois 61242 Telephone 309/654 2241 NJK-75-225 S)[ll! (/9 /

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b C g-; l3. , n gi5, ",,'q Mr. John F. O' Leary, Director q #p w/

Directorate of Licensing Regulation  % s.e** 37 U. S. Nuclear Regulatory Commission / i Washington, D. C. 20545 e, / - ,

Reference:

Quad-Cities Nuclear Power Station Docket No. 50-265, DPR-30 .

Appendix A, Sections 1.0.A.4, 6.6.B.I.a

Dear Mr. O' Leary:

Enclosed please find Abnormal Occurrence Report No. 50-265/75-13 for Quad-Cities Nuclear Power Station. This occurrence was previously reported to Region ill, Directorate of Reculatory Operat ions by telephone on April 21, 1975 and to you and Region lit, Directorate of Regulatory Operations by telecopy on April 21, 1975

.This report is submitted to you in accordance with the requirements of Technical Specification 6.6.B.I.a.

Very truly yours,

, COMMONVEALTH EDISON COMPANY QUAD-CITIES NUCLEAR POWER STATION

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N. J. Kalivianakis' .

Station Superintendent NJ K/SRH/vmm

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Enclosure cc: Region lil, Directorate of Regulatory Operations J. S. Abel f

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COPY SEN1' REGION- , -

O O REPORT NUMBER: A0-50-265/75-13 REPORT DATE: April 28,1975 OCCURRENCE DATE: April 18,1975 FACI L I TY : l Quad-Ci ties Nuclear Power S tation Co rdova , Illinois 61242 IDENTI FICATION OF OCCURRENCE:

Core spray pump 2B auto start failure during the first phase of the Emergency Core Cooling System simulated automatic actuation surveillance test.

CONDITIONS PRIOR TO OCCURRENCE:

Unit 2 was in the cold shutdown mode for refueling.

DESCRIPTION OF OCCURRENCE:

On April 18, 1975 at 8:00 p.m. the Emergency Core Cooling System (ECCS)

Simula'ted Auto Actuation and Diesel Generator Auto-Start Surveillance test (QTS 110-3, Revision 1) was being run. When the reactor vessel water lo-lo level signal was simulated, the 2B core spray pump did not auto start prior to the bus 24-1 trip. After bus 24-1 was tripped and diysel generator 2 auto closed into bus 24-1, the 2B core spray pump did auto start.

DESIGNATION OF APPARENT CAUSE '0F OCCURRENCE:

The cause of this occurrence was a loose terminal connection on control panel 902-33, terminal AA-43 ANALYSIS OF OCCURRENCE: -

Although 2B core spray pump would not start on automatic initiation from its normal source,-it did auto start from its emergency source and could have been manually started. Had an initiation signal been received during normal operation, 2A core spray pump would have started and supplied 100% of the required co're spray flow. All four Residual Heat Removal System pumps also would have started and added water to the reactor. In view of this, the inability of 2B core spray pump to start in one of its three modes poses minimal safety implications and had no effect on'the health and safety of the public. .

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r O O A0 50-265/75-13 April 28.1975 CORRECTIVE ACTION:

The inmediate corrective action was to determine the cause of the f ailure of the 2B core spray pump to auto start ir, one instance and not the other.

The loose connection was subsecuently found and tightened. Auto-start of 2B core spray pump on its normal source was successfully tested on April 20, 1975 FAILURE DATA: -

There have been no similar auto start failures of the 28 core spray pump or the other core spray pumps due to a loose terminal connection. There-fore there are no safety implications based on cumulative experience.

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