ML20135B676
| ML20135B676 | |
| Person / Time | |
|---|---|
| Site: | Quad Cities  |
| Issue date: | 11/20/1996 |
| From: | Kraft E COMMONWEALTH EDISON CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| ESK-96-214, GL-95-07, GL-95-7, NUDOCS 9612050093 | |
| Download: ML20135B676 (3) | |
Text
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,3 Commonwralth Ediwn Company Quad Cities Generating Station 22710 206th Aventic North
- Cordova. 11.61242 9740 Tri.w><>s i 22 o ESK-96-214 November 20,1996 United States Nuclear Regulatory Commission Washington, DC 20555 Attention:
Document Control Desk I
Subject:
Quad Cities Station Unit 1 and 2 NRC Request for Additional Information for Generic Letter 95-07, dated June 5,1996 NRC Docket No3. 50-254 and 50-265
References:
(a)
Comed Response to NRC Request for Additional Information
- Generic Letter 95-07, dated June 28,1996.
(b)
NRP Request for Additional Information for Generic Letter 95-07, dated June 5,1996.
In the Request for Additional Information, reference (b), the NRC posed the following question:
Regarding the potential susceptibility of valves 1(2)-2301-3, HPCI Turbine Steam Supply, to thermal binding, Commonwealth Edison's (Comed) submittal states that these valves are closed hot after stroke testing or High Pressure Coolant Injection (HPCI) flow testing and remain hot prior to an initiation signal. Does Comed have test data, such as temperature measurements of the valve body while open and later shut, to verify this assertion? If so, please provide these results for the staff's review.
In Comed's response to the NRC Request for Additional Information, refuence (a), Quad Cities Station committed to collecting the test data and providing it to the NRC within 30 days of data collection. Although the data was collected in September 1996, due to an administrative oversight it was not forwarded as scheduled.
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ESK-96-214 November 20,1996 i
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Thermography scanning was performed on the HPCI steam supply valve bodies for both units. The data was collected before, during, and after runs of the HPCI system. The post HPCI run data was taken a minimum of 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> after the run.
i Unit I was at approximately 8% reactor power (initial high pressure run during i
startup), while Unit 2 was at 100% reactor power.
The point temperatures (degrees F) for each image are provided below. The j
temperatures shown are the temperatures at approximately one foot upstream of i'
valve centerline, valve centerline (disk position), and one foot downstream of valve centerline.
UNIT 1 (decrees F)
Upstream Disk Downstream Before HPCI Run 513 405 362 During HPCI Run 390 400 396 j
After HPCI Run 511 421 359 UNIT 2 (decrees F) i Upstream Disk Downstream Before HPCI Run 526 431 335 During HPCI Run 530 528 523 After HPCI Run 521 429 333 The temperature point most important to the thermal binding concern is the valve body centerline (disk position). This area of the valve body would have to cool significantly to cause binding on the valve disk. Tne data collected shows that the worst case is Unit 2 which cools approximately 100 degrees F after valve closure. The data shows that the valve remains hot after closure and the HPCI run demonstrates that cooling 100 degrees F is not significant enough to cause thermal binding. The flexible wedge designed valve disk also minimizes thermal binding by " flexing" if the valve body contracts when cooling occurs.
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ESK-96-214 November 20,1996 i
If you have any questions concerning thit letter, please contact Chuck Peterson, Regulatory Affairs Manager, at (309) 654-2241 extension 3602.
Respectfully,
&.l*bb b, E. S. Kraft r.
Site Vice resident Quad Cities Nuclear Power Station A. B. Beach, Regional Administrator, Region III cc:
R. M. Pulsifer, Project Manager, NRR C. M. Miller, Senior Resident Inspector, Quad Cities D. C. Tubbs,.MidAmerican Energy Company R. J. Singer, MidAmerican Energy Company F. A. Spangenberg, Regulatory Affairs Manager, Dresden C. C. Peterson, Regulatory Affairs Manager, Quad Cities DCD License (both electronic and hard copies) l
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