ML20070C994
| ML20070C994 | |
| Person / Time | |
|---|---|
| Site: | Fort Calhoun  |
| Issue date: | 12/09/1982 |
| From: | William Jones OMAHA PUBLIC POWER DISTRICT |
| To: | Clark R Office of Nuclear Reactor Regulation |
| References | |
| REF-GTECI-A-49, REF-GTECI-RV, TASK-A-49, TASK-OR LIC-82-399, NUDOCS 8212140416 | |
| Download: ML20070C994 (3) | |
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Omaha Public Power District 1623 H arf 4EY a OMAHA. NE8RAAMA 68102 8 T E L E P H O N E 5 3 6 4 t* -, AREA CODE 402 December 9, 1982 LIC-82-399 Mr. Robert A. Clark, Chief U. S. Nuclear Regulatory Comission Office of Nuclear Reactor Regulation Division of Licensing Operating Reactors Branch No. 3 Washington, D.C.
20555
Reference:
Docket No. 50-285
Dear Mr. Clark:
Audit cf Fort Calhoun Station Procedures and Training that Address the Pressurized Thermal Shock Issue An audit of the Fort Calhoun Station procedures and training that address the pressurized thermal shock issue was conducted on June 8-10, 1982 by the Comission and Pacific Northwest Laboratory personnel.
The Comission's letter to Omaha Public Power District dated October 12, 1982 detailed the findings of the audit and included four recomend-ations for the Fort Calhoun Station for which action was recomended.
The District's response to cach of the recomendations is attached.
Sincerely, W
f W. C. J pes Divisio'1 Manager Production Operations WCJ/TLP:jm Attachment cc:
LeBoeuf, Larrb, Leiby & MacRae 1333 New Harrpshire Avenue, N.W.
OY7 Washington, D.C.
20036 f
8212140416 B21209 PDR ADOCK 05000285 P
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Attachment DISTRICT'S RESPONSE TO PTS RECOMMEllDATIONS OF C0f411SS10N'S LETTER DATED OCTOBER 12, 1982 Reconmendation 1 Minimum and maximum subcooling margin curves, the NDT curve and the saturation curve should all be reviewed for accuracy and made available on a single plot in a central location in the control room. We recom-mend this in lieu of curves in each procedure to ensure consistency and accuracy of the plots.
Response
The two curves which are applicable to EP's involving possible PTS are the 1000F/hr cooldown curve and the 500F subcooling curve. These curves have been plotted on a single graph and displayed on top of the computer console in the control room in addition to the applicable EP's.
However, there are some EP's not involving PTS for which only the NDT 0
curve is appropriate, or for which only the 50 F subcooling curve is appropriate. These EP's have not been revised.
Reconmendation 2 If maximum RCS pressure for a given temperature condition are stated separately in the procedures, the pressure should be made consistent throughout all procedures that use them.
Response
The indicated temperature differences in 01-RC-3 (heatup) and 01-RC-4 (cooldown) for the stated maximum allowable RCS pressures are legitimate values. The 100F deadband difference for the upper RCS pressure limit and the 200F deadband differrnce for the lower pressure limit are conservative values which were selected to preclude inadvertent opening of the power operated relief valves during plant startup. The offset between the heatup and cooldown curves also impacts the difference in the stated physical parameters for these procedures. The temperature and pressure values used in the EP's are consistent with 01-RC-4, which is appropriate.
No revisions are neccssary in response to this recommendation.
Recommendation 3 The practice of using two different saturation curves with reverse axis should be discontinued.
Recommendation 1 should be applied.
Response
All saturation curves have been made consistent with one another and now include the 500F subcooled curve on pressure vs. temperature axes.
e 2
Recommendation 4 until the subcooling margin monitor is upgraded-for use below 4650F, a label should be affixed in the vicinity of the meter to remind the operators not to use it below 4650F.
Response
A label has been attached to CB-4 next to the subcooled margin monitors to remind the operators not to use them below an RCS temperature of 4650F t
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