ML20072B235
| ML20072B235 | |
| Person / Time | |
|---|---|
| Site: | Fort Calhoun  |
| Issue date: | 05/20/1983 |
| From: | William Jones OMAHA PUBLIC POWER DISTRICT |
| To: | Jay Collins NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| REF-SSINS-6820 IEB-83-03, IEB-83-3, LIC-83-106, NUDOCS 8306130364 | |
| Download: ML20072B235 (3) | |
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Omaha Public Power District 1623 Hamey Omaha, Nebraska 68102 402/536 4000 May 20, 1983 LIC-83-106
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W(271983 Mr.
J.
T.
Collins, Administrator o
U.
S.
Nuclear Regulatory Commission
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Region IV 611 Ryan Plaza Drive, Suite 1000 Arlington, Texas 76011
Reference:
Docket No. 50-285
Dear Mr. Collins:
Check Valve Failures in Raw Water Cooling Systems of Diesel Generators IE Bulletin 83-03 The subject bulletin requested Omaha Public Power District to take the following actions concerning check valves in the Fort Calhoun Station's (FCS) diesel generator cooling systems:
1.
Licensees are requested to review the plant pump and valve in-service test (IST) program required by Section XI of the ASME Boiler and Pressure Vessel Code and modify it if necessary to include check valves in the flow path of cooling water for the diesel gener-ators from the intake to the discharge.
Those por-tions of the cooling water system which do not direct-ly supply the diesel may be excluded from this review.
For example, if the cooling water to the diesel is sup-plied by the normally operating service water system, the loop of piping to the diesel from the service water piping and back must be considered, but not the complete service water system.
For those cooling water systems which come into operation only upon demand for diesel cooling, all portions of the system which are required to change state must be reviewed.
2.
For the valves described in (1) above, licensees are requested to examine the IST program and modify it if necessary to include verification procedures that con-firm the integrity of the valve internals.
This may be accomplished by using both a forward flow and a back flow test or by valve disassembly and inspection.
Other equally effective means of assuring integrity of the valves may be used.
A reasonable schedule for the test of these valves shall also be included in the IST program.
4ssed 8306130364 830520
' **"$ NFIm"a'fe PDR ADOCK 05000285 f[f O
PDR l
Mr. J.
T.
Collins LIC-83-106 Page Two 3.
Licensees are requested to perform initial valve inte-grity verification procedures for the valves identi-fled in (1) above using the methods described in (2) above, to be completed by the end of the next refuel-ing outage commencing after April 1, 1983.
4.
Licensees are requested to submit a report to the NRC within 90 days of the date of this bulletin, which lists the valves identified in (1) above and describes the valve integrity verification procedure methods and schedule identified in (2) above.
This report should include the history of any known previous failures of these valves at your plant.
5.
Licensees are requested to submit a report to the NRC within 90 days of completion of the results of the initial valve integrity verification procedure per-formed in accordance with (3) above.
For those valves which are found to have undergone either partial or complete disassembly of valve internals, a description of the failure mode should be included.
The cooling systems on the FCS's two emergency diesel gener-ators are integral parts of the diesel engines and require no external support (i.e., coolant supply) during perform-ance of their emergency functions.
There are no check valves associated with these systems as can be seen on the attached Drawing No. B120F04002.
The District therefore deems this issue resolved and further action unr.ecessary.
Please consider this letter a written response to both items 4 and 5 above.
Sinc
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A W.
C.
ones Divisi;on Manager Produdtion Operations WCJ/TLP:jmm Attachment b
cc:
LeBoeu f, Lamb, Leiby & MacRae 1333 New Hampshire Avenue, N.W.
Washington, D.C.
20036 Mr.
E.
G.
Tourigny, Project Manager Mr.
L.
A.
Yandell, Senior Resident Inspector
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