ML19275A634
| ML19275A634 | |
| Person / Time | |
|---|---|
| Site: | Wolf Creek  |
| Issue date: | 09/27/1979 |
| From: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | Koester G KANSAS GAS & ELECTRIC CO. |
| References | |
| NUDOCS 7910180039 | |
| Download: ML19275A634 (1) | |
Text
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o UNITED STATES NUCLEAR REGULATORY COMMISSION O %')) 'i
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REGION IV
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611 RYAN PLAZA DRIVE, SUITE 1000
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ARLINGTON, TEXAS 76012 s n,r '
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September 27, 1979 In Reply Refer To:
RIV Docket No.
STN 50-482/IE B:41etin No. 79-24 Kansas Gas & Electric Co.
Attn:
hk. Glenn L. Koester Vice President-Operations Post Office Box 208 Wichita, Kansas 67201 Gentlemen:
The enclosed IE Bulletin 79-24 is forwarded to you for information. If you desire additional information regarding this matter, please contact this office.
Sincerely,
/
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v y Karl V. Shyfrit D4 rector
Enclosures:
1.
Designated Applicants for Operating Licenses 3.
List of IE Bulletins Issued in Last Six Months cc: w/ enclosures Messrs. Nicholas A. Petrick, SNUPPS D. T. McPhee, Kansas City Power and Light Company Gerald Charnoff, Shaw, Pittman, Potts & Trowbridge E. W. Creel, Kansas Gas and Electric Company 1184 240
/910180 0 3f
Accession No. 7908220114 SSINS No:
6820 UNITED STATES NUCIIAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASIIINGTON, D.C.
20555 IE Bulletin No. 79-24 Date:
September 27, 1979 Page 1 of 2 FR0 ZEN LINES Summary:
On January 3, 1979, an unusual event occurred at Davis-Besse, Unit 1.
The event involved the freezing of the water ir a portion of the high pressure coolant injection (HPCI) system recirculation line that is common to both high pressure coolant injection pumps. The line was not thawed until January 5, 1979, and the event was not reported to NRC until March 12, 1979.
In addition, over the past five years, there have been several events involving frozen instrument and sampling lines.
Description of Circumstances:
The condition was discovered on January 3, 1979, while the reactor was operating at approximately 96 percent power. During a monthly surveillance test of the HPCI pumps, there was no flow through the recirculation line from the pump discharge to the Borated Water Storage Tank (BWST).
Investigation revealed that water in a portion of the line exposed to the outside weather was frozen.
This portion of the line to the BWST is common to both HPCI pumps. The line has redundant heat tracing (a heated wire to prevent freezing); it is insulated; and it has a low-temperature alarm system to warn of freezing conditions.
Water in the line froze apparently because of prolonged sub-freezing temperatures and a defect in the insulation. There was no apparent malfunction of the heat tracing or temperature alarm circuits, although the temperature sensing elements are located in an area not exposed to the coldest temperature conditions.
This recirculation line serves two purposes: One is to provide a flow path for surveillance testing, and the other is to :rovide a minimum flow path to prevent possible damage to the pump in the event it is operated against a closed discharge valve or a reactor coolant system pressure greater than the maximum discharge pressure of the pump (approximately 1600 psig).
In the initial review of the event on J
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that the pumps were still operable with no immediate action was taken to thaw t January
, 1979, the line was thawed an DUPLICATE DOCUf'ENT was suct sfully completed.
Entire dor ment previously entered into system under:
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