ML20084S153

Ro:On 770507,station Experienced Momentary Short Period of Less than 5s During Shutdown Margin Demonstration.Similar Experience Occurred on 770504.Addl Info Will Be Submitted in RO 50-254/77-23

ML20084S153
Person / Time
Site:	Quad Cities
Issue date:	05/09/1977
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-77-204, NUDOCS 8306160187
Download: ML20084S153 (2)

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NJ K-77-204 Telecopy: Region Ill, Attention: Mr. N. Jackiw ,

-Mcy 9, 1977 m J. Keppler, Regional Director Office of Inspection and Enforecment Region til U.S. Nucicar Regulatory Conilssion 799 Roosevelt Road ,

Glen Ellyn, Illinois 60137 ,

Reference:

Quad-cities Nuclear Power Station, Unit 1 Docket No. 50-254. DPR-29

• Appendix A Section 6.6.B. I.d.

Decr Mr. Keppler:

The purpose of this letter is to provide you with notification of a Reportabic Occurrence as required by Technical Specification 6.6.8.1 within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> of

• the occurrence. e. p on May 7,1977 the statica experienced a momentary short period of less than fiva seconds en Unit One during a shutdown nsrgin desonstration. This occur-rence desnonstrated that a short period of less than five seconds was also experienced on ifnit Cnc during a similar shutdcwn rmrgin deconstration per-formed on May 4,1977. On May 4 howcVer, the period information was in- * '

suf ficient to clearly demonstrate the magnitude of the suspect period and

.in antysis of the data available led to the conclusien that a short period had not occurred. An in-house deviation report (D-4-1-77-40) was initiated -

.fcr the tiay l,1977 occurrence because the procedure for performing the i

shutdown margin was not folicwed. The operator quickly inserted the notch ,

to terminate the event.

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To demonstrate that a short period had not occurred, and to obtain the j necessary shutdown margin data, the test was repeated on Hay 7,1977 At that time an error in judgement was inade by the nuclear engineer in alicwing i(

the reactor operator to continuously withdraw a centrol. rod during approach 1 to the critical rod configuration. In addition, a procedure violation occurred f In that the rod movements performed were not governed by ars approved procedure. ,

The critical rod had to be re-Inserted to establish a managutte period. This .  ! h occurrence demnstrated the existence of momentary periods shorter than 5 2.econds I C.

In both shutdown margin der.onstration cases. ]

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• l O O In ca..h case the irtediate action taken by the reactor operator was safe, co r rec t. , and appropriate. The short perieds existad for only approximately 4 seconds and 9 soccads respectively. There were no healtn or safety consequences resulting f rce this occur rence.

This occurrence was discussed by telephone with Mr.14. Jackiw of your office on Hay 8, 1977 Further information will be provided by Reportable Occurrence Report Ro 50-254/77-23 which wii1 be submitted within 14 days of the date of l this occurrence.

Very truly yours, COMM0!iWEALTH EDIS0!l CC?tPAtlY QUAD-C ITI ES t1UCLEAR PC'-lER STATIOfJ 1

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fl . J . Kalivianakis j \

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