ML20084S140

Ro:On 770512,unit Experienced Sudden Turbine Control Valve Opening Resulting in Feedwater Flow Increase & Reactor Scram from APRM flux.Short-term Reactivity Increase Corresponding to Reactor Period of Less than 5s Experienced

ML20084S140
Person / Time
Site:	Quad Cities
Issue date:	05/13/1977
From:	Kalivianakis N COMMONWEALTH EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20084S143	List: ML20084S140 ML20084S153
References
NJK-77-214, NUDOCS 8306160180
Download: ML20084S140 (2)

Text

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Comm:nMth Edison Quid Citi;s Nucl:tr Pow:r Station O ,

22710 206 Avenue North Corcova, filinois 61242

/ ". 1 Tetephone 309/654-2241 NJK-77-214 Telecopy: Region lit, Attention: Mr. N. Jackiw May 13, 1977 J. Keppler, Regional Director Office of Inspection and Enforcement Region til U. S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, Illinois 60137 Refe rence: Quad-Cities Nuclear Power Station, Unit 1 Docket No. 50-254, DPR-29 Appendix A, Section 6.6.B.I.d

Dear Mr. Keppler:

The purpose of this letter is to provide you with notification of a Reportable Occurrence as required by Technical Specification 6.6.B.I within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> of the occurrence.

At 2:30 p.m. on May 12, 1977 with Unit One operating at 200 MWe, the unit experienced a sudden turbine control valve opening resulting in a feedwater flow increase and a reactor scram from APRM high flux. Based on the magnitude of the power transient as indicated on the APRM recorder charts, and the length of time observed by the process computer for the duration of the tran-sient, it has been concluded that a short-term reactivity increase corresponding to a reactor period of less than 5 seconds was experienced.

This occurrence was discussed at the station with Mr. N. Jackiw of your office on May 12, 1977. Further information will be provided by Reportable Occurrence Repor't RO 50-254/77-24 which will be submitted within 14 days of the date of this occurren.:e.

Very truly yours, #

COMMONWEALTH EDISON COMPANY QUAD-CITIES NUCLEAR POWER STATION f

N. J. Kalivianakis d //f/h Station Superintendent l NJK/GS/lk cc: M. S. Turbak 8306160180 770513 10I977 PDR ADOCK 05000254 S PDR

p/P.?- ' Commonvg'ar th Edison l'ower Station (~j V

Cuad Cities N kl Q

• D 22710 200 Avenue North Cordova, I!!incia 61242 D Tc!cphono 303/054-0241 i

NJ K-77-214 Telecopy: Region ill, Attention: Mr. N. Jackiw Hay 13, 1977 J. Kcppler, Regional Director

• Office of Inspection and Enforcement Region til U. S. Nuclear Regulatory Commission 799 Rooseve1t Road Glen Ellyn, Illinois 60137

. a Refe rence: Quad-Cities Nuclear Power Station, Unit 1 Docket No. 50-254, DPR-29 Appendix A, Section 6.6.B.I.d

Dear Mr. Keppler:

The purpose of this letter is to provide you with notification of a Reportable Occurrence as required by Technical Specification 6.6.B.1 within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> of the occurrence.

At 2:30 p.m. on May 12, 1977 with Unit One operating at 200 MWe, the unit experienced a sudden turbine control valve opening resulting in a feedwater flow increase and a reactor scram from APPJi high flux. Based on the magnitude of the power transient as indicated on the APRM recorder charts, and the length of time observed by the process computer for the duration of the tran-sient, it has been concluded that a short-term reactivity increase corresponding to a reactor period of less than 5 seconds was experienced.

This occurrence was discussed at the station with Mr. N. Jackiw of your office on May 12, 1977 Further information will be provided by Reportable Occurrence Repor't RO 50-254/77-24 which will be submitted within 14 days of the date of this occurrence.

Very truly yours, '

COMMONWEALTH EDISON COMPANY QUAD-CITIES NUCLEAR POWER STATION

[ 5 * #f((

N. J. Kalivianakis Station Superintendent

• NJr/GS/lk cc: H. S. Turbak MAY I g 1977