ML20216C022
| ML20216C022 | |
| Person / Time | |
|---|---|
| Site: | Clinton  |
| Issue date: | 05/14/1998 |
| From: | Hopkins J NRC (Affiliation Not Assigned) |
| To: | Sipek J ILLINOIS POWER CO. |
| References | |
| GL-97-04, GL-97-4, TAC-M99975, NUDOCS 9805190064 | |
| Download: ML20216C022 (5) | |
Text
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.May.14, 1998 l
Mr. Joseph V. Sipek Director - Licensing Clinton Power Station P.O. Box 678 Mail Code V920 Clinton,IL 61727
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION RELATED TO THE GL 97-04 RESPONSE FOR THE CLINTON POWER STATION, UNIT 1 (TAC NO. M99975)
Dear Mr. Sipek:
The staff issued Generic Letter (GL) 97-04, " Assurance of Sufficient Net Positive Suction Head for Emergency Core Cooling and Containment Heat Removal Pumps," on October 7,1997. The i
GL requested that licensees provide information necessary to confirm the adequacy of the net positive suction head available for emergency core cooling and containment heat removal pumps. By letter dated December 29,1997, Illinois Power submitted its 90 day response to GL 97-04. The staff has reviewed your response and has determined that additionalinformation is necessary. Please provide the information in the enclosed request within 45 days of receiving this letter.
Contact me if you hm, any questions.
Sincerely, Original signed by:
Jon B. Hopkins, Senior Project Manager Project Directorate 111-3 Division of Reactor Projects Ill/IV Office of Nuclear Reactor Regulation Docket No. 50-461 Distribution:
Docket File PUBLIC
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May 14, 1998 Mr. Joseph V. Sipek Director - Licensing Clinton Power Station P.O. Box 678 Mail Code V920 Clinton,IL 61727
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION RELATED TO THE GL 97-04 RESPONSE FOR THE CLINTON POWER STATION, UNIT 1 (TAC NO. M99975)
Dear Mr. Sipek:
The staff issued Generic Letter (GL) 97-04, " Assurance of Sufficient Net Positive Suction Head for Emergency Core Cooling and Containment Heat Removal Pumps," on October 7,1997. The GL requested that licensees provide information necessary to confirm the adequacy of the net positive suction head available for emergency core cooling and containment heat removal pumps. By letter dated December 29,1997, Illinois Power submitted its 90 day response to GL 97-04. The staff has reviewed your response and has determined that addijional information is necessary. P! ease provide the information in the enclosed request within 45 days of receiving this letter.
Contact me if you have any questions.
Sincerely, Original signed by:
Jon B. Hopkins, Senior Project Manager Project Diredorate 111-3 Division of Reactor Projects lil/lV Office of Nuclear Reactor Regulation I
Docket No. 50-461 Distribution:
j Docket File PUBLIC i
F.nclosure: Request for Additional PD3-3 R/F ACRS l
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WASHIN SToN, D.C. 3066H001 4,.....,o May 14, 1998 Mr. Joseph V. Sipek Director-Licensing Clinton Power Station P.O. Box 678 Mail Code V920 Clinton,IL 61727
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION RELATED TO THE GL 97-04 RESPONSE FOR THE CLINTON POWER STATION, UNIT 1 (TAC NO. M99975)
Dear Mr. Sipek:
The staff issued Generic Letter (GL) 97-04," Assurance of Sufficient Net Positive Suction Head for Emergency Core Cooling and Containment Heat Removal Pumps," on October 7,1997. The GL requested that licensees provide information necessary to confirm the adequacy of the net positive suction head available for emergency core cooling and containment heat removal pumps. By letter dated December 29,1997, Illinois Power submitted its 90 day response to GL 97-04. The staff has reviewed your response and has determined that additionalinformation is necessary Please provide the information in the enclosed request within 45 days of receiving this letter.
Contact me if you have any questions.
l Sincerely, i
Jon B. Hopkins, Senior oject Manager Project Directorate ill-3 Division of Reactor Projects Ill/IV Office of Nuclear Reactor Regulation Docket No. 50-461
Enclosure:
Request for Additional Information cc w/ encl: See next page
Joseph V. Sipek Clinton Power Station, Unit 1 Illinois Power Company cc:
Walter G. MacFarland IV lilinois Department of Nuclear Safety Senior Vice President Office of Nuclear Facility Safety Clinton Power Station 1035 Outer Park Drive P.O. Box 678 Springfield,IL 62704 Clinton,IL 61727 Wayne Romberg Manager Nuclear Station Engineering Department Clinton Power Station P.O. Box 678 Clinton,IL 61727 Resident inspector U.S. Nuclear Regulatory Commission RR#3, Box 229 A Clinton,IL 61727 R. T. Hill Licensing Services Manager General Electric Company 175 Curtner Avenue, M/C 481 San Jose, CA 95125 Regional Administrator, Region til U.S. Nuclear Regulatory Commission 801 Warrenville Road Lisle, IL 60532-4351 Chairman of DeWitt County c/o County Clerk's Office DeWitt County Courthouse Clinton,IL 61727 J. W. Blattner Project Manager Sargent & Lundy Engineers 55 East Monroe Street Chicago,IL 60603
REQUEST FOR ADDITIONAL INFORMATION FOR RESOLUTION OF GL 97-04 ISSUES AT THE CLINTON POWER STATION (TAC NO. M99975) r
- 1. In response to GL 97-04 question 1, it is stated that the net positive suction head (NPSH) analyses assumed the emergency core cooling system (ECCS) strainers were 50% cloggad with a resultant 1-foot head loss through them, which is consistent with the purchase specification
.equirement. Has this assumption been confirmed given the information provided in NRC IN 97-277
- 2. In response to GL 97-04 question 2, it is stated that the General Electric process diagrams specify a required NPSH of 5 feet while the vendor performance curves shows the required NPSH to be 2 feet. Which NPSH requirement is used in the calculation of available NPSH?
- 3. Question 2 of Generic Letter 97-04 requested the identification of the required NPSH and available NPSH for the pumps that take suction from the suppression pool followin.g a design basis loss-of-coolant accident or secondary line break. The response to question 2 discusses the ECCS, not the individual pumps that make up the ECCS. Specify the required NPSH and available NPSH for the core spray pumps, the residual heat removal pumps, and the h
containment spray pumps, as applicable.
- 4. In response to GL 97-04 question 3, recently perfccmed bounding analyses were discussed which do not replace the Clinton Power Station design basis NPSH analysis. The equation used for the bounding analyses appears in Attachment 2 to your response and does not appear to be correct. Specifically, the staff is concerned with the addition of P, and the R(H,- H ) teim.
g Provide a more detailed explanation of this equation and specify the units used.
Enclosure e
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