ML19332B154
| ML19332B154 | |
| Person / Time | |
|---|---|
| Site: | Big Rock Point File:Consumers Energy icon.png |
| Issue date: | 09/02/1980 |
| From: | Hoffman D CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| IEB-80-17, NUDOCS 8009260125 | |
| Download: ML19332B154 (3) | |
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C0mpany c a.r. offic.,: 212 w.,e sienia n Av.au., ;.c=.on. usenio.n 4s:os. <s17: 7ss-osso September 2, 1980 Mr James G Keppler Office of Inspection and Enforcement Region III US Iinclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137 DOCKET 50-155 - LICENSE DPR BIG ROCK POINT PLAUT - RESPONSE TO SUPPLEMENT n0 3 TO IE EULLETIU NO 80 FAILURE OF CONTROL RODS TO INSERT DURING A SCRAM AT A BWR IE Supplement No 3, dated August 22, 1980, to IE Bulletin no 80-17, " Failure of 76 of 185 Control Rods to Fully Insert During a Scram at a BWR" (July 3, 1980) requested that acticn be taken to mitigate accumulated scram valve seal leakage which could fill the scrsn discharge volume.
As discussed in our previous letters in response to IE Bulletin No 80-17 items, specifically the August 8, 1980 letter, Big Rock Point has a significantly dif-ferent scram system design that BWR-II and later plants..Its present design provides instrumentation that indicates to the control room accumulation of water in the scram discharge volume (ie, scram discharge tank) and initiates an autcmatic scram pricr to insufficient scram discharge volume (SDV) capacity. Spe-cific responses to Supplement No 3 questions are provided for your information by Attachment I.
In summary, Consumers Power Ccmpany concludes that the current Big Rock Foint scram discharge system meets the requirements set forth in IE Bulletin no 80-17 and its Supplements Nos 1 thru 3 vithout additional modifications or surveillance.
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David P Hoffman Nuclear Licensing Ad=inistrator CC Director, Office of Nuclear Reactor Regulation Director, Office of Inspection and Enforcement URC Resident Inspector - Big Rock Point Attac!r.ent - 1 page 8009260 02G h
a CONSUMERS POWER COMPANY Big Rock Point Plant IE Bulletin 80-17 Supplement No 3 Docket 50-155 License DPR-6 At the request of the Comission and pursuant to the Atomic Energy Act of 195h, and the Energy Reorganization Act of 1974, as amended, and the Commission's Rules and Regulations thereunder, Consumers Power Company submits our response to Supplement No 3 to IE Bulletin No 80-17 dated August 22, 1980, entitled,
" Failure of Control Rods to Insert During a Scram at a BWR".
Consumers Power Company's response is dated September 2, 1980.
CONSU:-
o P0 MPANY By.
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R B DeWitt, Vice President Nuclear Operations Sworn and subscribed to before me this 2nd day of September, 1980.
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1 Linda K Carstens, Notary Public t
Jackson County, Michigan 1,
[My com:nicsion expires June 10, 1981.
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-( S;ptembsr 2,1980 ATTACRMENT I Response to IE Supplement 3 to Bulletin No 80-17:
Failure Of Control Rods To Insert During A Scram At A BWR Action 1 For those plants in which the scram discharge volume headers are connected to the instrument volume by a 2-inch pipe, within five days of the date of this Bulletin, provide or verify that procedures are in effect to:
a.
Require an immediate manual scram on low control rod drive air pressure with a minimum 10 psi margin above the opening pressure of the scram outlet valves.
b.
Require an immediate manual scram in the event of:
(1) Multiple rod drift-in alarm, or (2) A marked change in the number of control rods with high temperature alarms.
Response to Action 1 Big Rock Point uses a 6-inch pipe to connect to its scram discharge tank (SDT) which provides the entire active scrau discharge volume (SDV). The SDT includes instrumentation for level indication and automatic scram prior inadequate SDV capacity.
a.
Manual scram to address scram valve leakage is not required due to the existance of the present automatic scram which provides
.this function.
b.
Manual scram is not required as discussed above because of the automatic scram feature.
(1) The Big Rock Point design does not incorporate
" rod drift-in" alarms.
(2) Big Rock Point does employ operating procedures addressing rod drive "hi-temperature" alarms.
Action 2 In addition, every BWR licensee is requested within five days of the date of this bulletin to provide and implement procedures which require a functional test using water for the instrument volume level alarm, rod block and scram switches after each scram event, before returning to power. This procedure should remain in effect until modifications in addition to Item B.1 of IE Bulletin 80-17 Supplement No 1 are completed to substantially increase reliability of water level indication in the scram discharge volume (s).
1 Response to Action 2 Since the. requirements of Supplement No 1 to IE Bulletin No 80-17 have been
-met as described in our response dated August 8, 1980, the above required testing procedure following all scrams is not required.
It should be noted that functional test procedures for the SDT level alarm and scram switches are currently included in the Big Rock Point surveillance program.