ML20154F635

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Responds to IE Bulletin 88-007, Power Oscillations in Bwrs. All Licensed Reactor Operators & Shift Technical Advisors Performing Shift Duties Have Been Briefed on Lasalle Unit 2 Event
ML20154F635
Person / Time
Site: Clinton Constellation icon.png
Issue date: 09/13/1988
From: Hall D
ILLINOIS POWER CO.
To:
NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
IEB-88-007, IEB-88-7, NUDOCS 8809200074
Download: ML20154F635 (3)


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  • U- 601264 L30- 88(09-13)-LP 1A.120 ILLIN0/8 POWER COMPANY CLINTON PC%tm STAflON. P.O. 804 678. CLINTON. ILLINott 61727 I

DPH-0820-88 September 13, 1988 Docket No. 50-461 U.S. Nuclear Regulatory Commission Document Control Desk Washington, D.C. 20555

Subject:

Clinton Power Station Response to NRC Bulletin No. 88-07

Dear Sir:

This letter is in response to NRC Bulletin Number 88-07, "Power Oscillations in Boiling Water Reactors." The Attachment provides Illinois Power Company's response.

I hereby affirm that the information in this letter is correct to the best of my knowledge.

S erel yours,

. . all Vice President DPH/kar Attachment cc: Regional Administrator, Region III, USNRC NRC Clinton Licensing Project Manager NRC Rosident Office Illinois Department of Nuclear Safety 8809200074 680913 PDR ADOCK 05000461

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  • Attechmsnt Requested Actions
1) Within 15 days of receipt of this bulletin, all BWR  ;

licensees should ensure that any licensed reactor o)eratot or Shift Technical Advisor performing shift duties has been i l

thoroughly briefed regarding the March 9, 1988 LaSalle Unit  !

2 event. t Rasponse l All licensed Reactor Operators (RO) and Shift Technical Advisors (STA) performing shift duties have been briefed on the March 9, 1988 LaSalle Unit 2 event. l Requested Actions  ;

2) Within 60 days of receipt of this bulletin all BWR licensees [

should verify the adequacy of their procedures and operator  ;

training arograms to ensure that all licensed operators and .

Shift Technical Advisors are cognizant of l i

a) those plant conditions which may result in the ,

initiation of uncontrolled power oscillations  ;

i b) actions which can be taken to avoid plant conditions <

! which may result in the initiation of uncontrolled q power oscillations j l c) how to recognize the onset of uncontrolled power s

oscillations, and i

i d) actions which can be taken in response to uncontrolled -

power oscillations, including the need to scram the .

j reactor if oscillations are not promptly terminated.

Addressees should also verify the adequacy of the instrumentation i which is relied upon by operators within their procedures. l

, r 3 Response:

i The training programs have been reviewed and verified to be '

i adequate. The current cycle of R0 Requalification Training

, includes a lesson on the Loss of Coolant Flow off-normal a procedure. This lesson includes a discussion of the LaSalle  !

l Event and the procedure modifications Clinton Power Station has  ;

i performed to avoid such an occurrence. All license nolders and ,

STAS are enrolled in the requalification program. Future '

training programs for licensed operators and STAS will include i j this topic appropriately. (

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/., - Attachm:nt Illinois Power Company verified that the instrumentation will function adequately if the subject power oscillations occur at Clinton Power Station (CPS). Also, the operating procedures have been reviewed in response to this Bulletin. A change to Clinton Power Station (CPS procedure 4008.01 was made based on this review which addressed the action required when both recirculation pumps trip. With this change, the CPS procedures adequately address uncontrolled power oscillations.

As noted in the Bulletin, the implications on the bounds for neutron flux oscillations considered in previous safety analyses, including peak power resulting from asymmetric oscillations and the effects of recirculation pump trip actions for Anticipated Transients Without Scram (ATWS) events, require further study by the NRC and the utilities. When the information from this review is available, it will be evaluated for any required actions, j l

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