ML20084S361

RO 50-254/76-35:on 761203,discovered Discrepancy Between Tech Spec & Nedo 20360 Rod Worth Minimizer Operable Rated Power.Orders Written in Daily Order Book Requiring Rod Worth Minimizer Operability Below 20%

ML20084S361
Person / Time
Site:	Quad Cities
Issue date:	12/16/1976
From:	Kalivianakis N COMMONWEALTH EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20084S364	List: ML20084S361 ML20084S370
References
NJK-76-474, RO-50-254-76-35, NUDOCS 8306160704
Download: ML20084S361 (3)

Text

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Commonwealth Edison Ouad-Cities Nuclear Power Station E ~

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Post Office Box 216 %Pg /

Cordova. Illinois 61242 Telephone 309/654-2241 NJ K-76-474 .

December 16, 1976 J. Keppler, Regional Director Office of Inspection and Enforcement Region 111 U. S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, Illinois 60137

Reference:

Quad-Cities Nuclear Power Station Docket No. 50-254, DPR-29, Unit I Docket No. 50-265, DPR-30, Unit 2 Appendix A, Sections 3 3.B.3.b, 6.6.B.I.h Generic Reload Application for 8X8 Fuel, NEDO 20360, Supplement 4 April 1, 1976, Section 6.3.2.3.2.1.c Enclosed please find Reportable Occurrence Report No. 50-254/76-35 for Quad-Cities Nuclear Power Station. This occurrence was previously reported to Region lil, Office of Inspection and Enforcement by telephone on December 3, 1976 and by telecopy on December 6, 1976.

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

Very truly yours, COMMONWEALTH EDISON COMPANY QUAD-CITIES NUCLEAR POWER STATION

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• N. J. Kalivianakis Station Superintendent

'QOM NJ K/EAS/lk cc: G. A. Abrell

, 8306160704 761216 PDR ADOCK 05000254

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LICENSEE EVENT REPORT CONTROL BLOCK:l l l l l l l (PLEASE FIIIRfT ALL REGU5tEO IllipORAAATIDIll) 1 6 YPE YPE NAME LCENSE NUMBER O1 l 1 l L l Ql Al Dl1 l l0 l 0 l-l 0l- 0l 0l0 l0 l-l 0 l 025l l264l 1 l 0l 0l 0l [0 l1 l 14 30 31 32 7 89 15 EVENT OATE REPORT DATE OOCKET NUMBER O 1 CON'T l CATEGORY l l TYP W l 0 l 5 l 0 l-l 0 l 215l 4l 11l2lol31716l li 12 li 1617l 6l 68 69 74 75 80 7 8 57 58 59 60 61 EVENT DESCRIPTION BE l Quad-Cities Technical Specification 3.3.B.3.b states that the rod worth minimizer l 80 7 89

$ l shall be coerable below 10% rated power. However, the generic analysis for the l 80 7 89 3[ l rod drop accident for BWR 3's (General Reload Application for 8X8 fuel, NEDO 20360, l 80 7 89 0 l SuCOlement 4 April 1. 1976. section 6.3.2.3.2.1.c) states that the RWM should be l 80 7 89 l

GG l operable below 20% power. 80 7 89 mE SUPPUE58 MANUF A VOLATON DE CODE COMPONENT CODE BE l Zl Zl U lZ ]Z l Zl Zl 2l Z l 17 l Zl 43 lZ l9 l9 l9 l 44 47 W48 7 89 10 11 12 CAUSE DESCRIPTION 3[ l In order to standardize control rod sequencing for the rod drop accident (RDA) l 80 7 89 3@ l analysis, the General Electric Company proposed the generic Banked Position l 80 7 89 D2 l Withdrawal Sequences (BPWS) and at the same time raised the RWM (cont on attachment) l

% POWER OTHEA STATUS DISCOVERY OtSCOVERY OESCRPToN S

1 W l 019 l 5 l l NA l y l Station review of NEDO 20360 80 l

7 8 9 10 12 13 44 45 46 LOCATON OF RELEASE LE O OF R L ASE AMOUNT OF ACTIVITY DE 7 8 LZJ 9

LzJl 10 11 NA l 44 lNA 45 80 l

PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTON DE I d ol 0l l2j l NA 80 l

7 89 11 12 13 PERSONNEL INJURIES NUMBER DESCRIPTON NA l i BE l 4 0 l 0l l 80

! 7 89 11 12 OFFSITE CONSEQUENCES 3g l NA l 80 l 7 89 LOSS OR OAMAGE TO FACLRY TYPt DESCRPTON E2 d 7 89 l

10 NA 80 l

PUBLICITY l

l DE l NA 80 7 89 ADDITIONAL FACTORS l

18 l 80 7 89 l

D2 l 2

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PAGE 2 CAUSE DESCRIPTION CONTINUED operability requirement to 20% power. This was first documented in Supplement 3 September 1975 of the Generic Reload Application for 8X8 fuel, NEDO 20360, section 6.3 2.3 2. At that time, quad-Cities Units 1 and 2 used a plant-unique analyses for its control rod array definitions which allowed the station to write its own sequences and still adhere to a maximum incremental reactivity insertion for a RDA of I.3% AK.

Since September 1975, there have been two licensing submittals prepared and approved for Quad-Cities Station. Unit i Reload Two License Submittal was prepared in August 1975 and approved on-site in December 1975. This document referenced the Generic Reload Application for 8X8 fuel, NEDO 20360, Supplement 2, May 1975 This application did not include the RWM operability requirement of 20% power. Since Quad-Cities did not use the BPWS, it was presumed that the 20% RWM operability requirement did not apply. Unit 2 Reload Two License Submittal was prepared in June 1976, and approved on-site in August 1976. This document referenced supplement 4, April 1976 of NEDO 20360. The supplement called for the RWM to be operable up to 70% power. For this reload, General Electric supplied only an analysis according to the BPWS and not the usual unique analysis. In conjunction with consideration of the impilcations for Unit 2, it was discovered that the 20% power RWM operability limit would not only apply to Unit 2 but might also apply to Unit 1. This was not found earlier because the Unit I, Cycle 3, licensing submittal did not reference the correct NEDO 20360 supplement; it referenced Supplement 2 rather than Supplement 3 Confirmation that the RWM operability limit was 20% power for both units was received on December 2, 1976.

ANALYSIS OF OCCURRENCE Even though the past operability requirement for the RWM was 10% power the RWM is designed to alarm and apply blocks up to 20% power. But no provision of a substitute verification was made if the RWM was in-operable between 10 and 20% power. Since September 1975, both units have operated in the 10-20% power region for a total of about 60 hours6.944444e-4 days <br />0.0167 hours <br />9.920635e-5 weeks <br />2.283e-5 months <br />.

There is no record of an out of sequence rod between the 10 and 20%

power range during this time. Therefore, the consequences of the occurrence are minimal. The health and safety of the public was not affected by this occurrence.

CORRECTIVE ACTION On December 3, 1976, orders were written in the Daily Order Book requiring RWM operability below 20%. A change to the Technical Specifications has been initiated to require RWM operability below 20% power. All future revisions and supplements to the Generic Reload Appilcation for 8X8 fuel, NEDO 20360 will be on-site reviewed. These actions should be sufficient to preclude an event of this type from recurring.

FAILURE DATA There has not been an occurrence of this type before at quad-Cities Station.

There are no safety implications based on cumulative experience.