ML20079M949

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Defers B-O Startup Testing Originally Scheduled for Present Fuel Cycle to Next Fuel Cycle Due to Problems W/Boiler Feed Pump 1C.Xenon Stability Test Requires Tech Spec Amend
ML20079M949
Person / Time
Site: Fort Saint Vrain Xcel Energy icon.png
Issue date: 01/13/1984
From: Warembourg D
PUBLIC SERVICE CO. OF COLORADO
To: Wagner P
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
FRN-50FR27508 P-84025, NUDOCS 8401270480
Download: ML20079M949 (2)


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public service company ce odomde V" 16805 WCR 19 1/2, Platteville, Colorado 80651

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January 13, 1984 Fort St. Vrain Unit #1 P-84025 l

Mr. Philip Wagner, Project Manager '

U. S. Nuclear Regulatory Commission u. 986102 W Region IV 1hi <

611 Ryan Plaza Drive, Suite 1000 ,

Arlington, TX 76G11 . ( M j8dOk @ [ g

SUBJECT:

Fort St. Vrain B-0 Start-Up Tests

REFERENCE:

PSC Letter, Warembourg to Wagner, Dated 8-30-83 (P-83294)

Dear Mr. Wagner:

In the referenced letter, I stated that with the exception of Sequence 75 (Xenon Stability Tests) and Sequence 79 (Turbine Load

Rejection) we planned to complete the B-0 Start-Up Testing during this fuel cycle. Since that time, however, we have continued to experience problems with tne 1C Boiler Feed Pump which have precluded

. the plant from any significant operations above 70% power.

! Therefore, with only one week remaining before the start of

( Refueling #3, our testing plans must be deferred to the next fuel cycle. The testing expected to be performed at that time remains as previously indicated but now includes the Xenon Stability Tests.

Performance of the Xenon Stability Tests, as also stated in the referenced letter, will require a Technical Specification amendment.

In order to produce the necessary flux perturbation, the test should be performed when the plant is at 100% power and a ring 4 control rod is withdrawn 40 to 140 inches. Since these core conditions are not possible given the rod withdrawal sequence for the next fuel cycle, one or more ring 4 control rods will have to be inserted out of sequence to introduce this necessary flux perturbation. How many control rods and how far they must be inserted have not yet been determined, but such information will accompany the amendment request.

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With reference to the elimination of the Turbine Load Rejection test, it remains.our centention that the November 9, 1981, transient more than adequately demonstrated the plant response and, in fact, represented a more severe transient than that imposed by the Sequerce 79 and. Sequence 80 testing. We recognize that this transient did not moet the criteria of the Sequence 79 and Sequence 80 testing, but since it did demonstrate the plant's response in terms of assuring the protection of public. health and safety, the development of new acceptance criteria may be justified. We are currently evaluating this transient to more specifically address the individual elements of the current testing and will submit the findings along with any proposed acceptance criteria modifications for Nuclear Regulatory Commission concurrence when completed.

If you have any questions, please contact me at (303) 785-2224.

Very truly yours, Oc,s(Akvedow<y TYlhdA Don Warembourg, Manager, Nuclear Production DWW/djm

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