ML19327A605
| ML19327A605 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 07/03/1980 |
| From: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Daltroff S PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| References | |
| NUDOCS 8008060463 | |
| Download: ML19327A605 (1) | |
Text
UNITE 3 STATES y neeoq'o, NUCLEAR REGULATORY COMMISslON n
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$31 PARK AVENUE e4 ximo or enuss: A. ecNNsVLVANIA 19408 Docket Hos. 50-277 July 3, 1980 50-278 Philadelphia Electric Company ATTN: Mr. S. L. Daltroff Vice President Electric Production 2301 Market Street Philadelphia, Pennsylvania 19101 Gentlemen:
The enclosed IE Bulletin No. 80-17, is forwarded for action.
Prepare to perform the scram tests contained in the Bulletin; however, the 20-day time clock for completing will begin upon notification by telephone from the IE Regional Office.
The testing shall be performed as directed unless shutdown would severely impact the pcwer reliability in your area as shown by appropriate and timely documentation to the Director of the Office of Inspection and Enforcement.
A written response to the Bulletin is required. If you desire additional informa-tion regarding this matter, please contact this office.
Sincerely, oe H. Grier irector
Enclosures:
1.
List of Recently Issued IE Bulletins CONTACT:
D. L. Caphton (215-337-5266) l 8008000N3 g
m Philadelphia Electric Company 2
cc w/encls:
W. T. Ullrich, Station Superintendent Troy B. Conner, Jr., Esquire Eugene J. Bradley, Esquire Raymond L. Hovis, Esquire Michael J. Scibinico, II, Assistant Attorney General e
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ENCLOSURE 1 SSINS No.: 6820 Accession No.:
8005050076 UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT July 3, 1980 IE Bulletin No. 80-17 FAILURE OF 76 0F 185 CONTROL RODS TO FULLY INSERT DURING A SCRAM AT A BWR Description of Circumstances:
On June 28,1980, 76 of the 185 control rods failed to fully insert during a routine shutdown at TVA's Browns Ferry Unit No. 3 located at Athens, Alabama.
The reactor was manually scrammed from about 30 percent power in accordance with routine shutdown procedures.
The shutdown was initiated to repair the feedwater system.
The 76 control rods that failed to fully insert were all on the east side of the core.
Following scram discharge volume (SDV) high level bypass and a short drain period of the SDV, a second manual scram was initiated and all partially inserted rods were observed to drive inward, but 59 remained partially withdrawn.
A third manual scram was made, again following high level in the SDV and bypassing for another short drain of the SDV, with the result that 47 rods remained partially withdrawn.
Following a longer drain of the SDV, an automatic scram occurred that was initiated by a scram discharge volume tank high water level signal when the scram reset switch was placed in " Normal"; with this scram all remaining rods fully inserted.
The total time elapse from the initial scram to the time that all rods were inserted was approximately 15 minutes.
Core coolant flow, temperature and pressure remained normal for plant conditions. The unit is now shutdown and additional testing indicates that a possible cause of the malfunction was the retention of a significant amount of water in the east bank scram discharge volume.
In view of these interim findings and pending results of continued investigation, the following actions are to be taken.
Actions To Be Taken By Licensees:
All General Electric Boiling Water Reactors with operating licenses which are operating at any power on the date of,this Bulletin shall perform the following steps in the time stated.
Those tt
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following steps prior to operating j
DUPLICATE DOCUMENT Within 3 days from the date of f 1.
Entire document previous 1 tests to verify that there is }
entered into system under-Discharge Volume (SDV) and as:
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areoperableandventsystem.j ANO No. of pages:
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