ML20153B986
| ML20153B986 | |
| Person / Time | |
|---|---|
| Site: | Wolf Creek  |
| Issue date: | 02/11/1986 |
| From: | Koester G KANSAS GAS & ELECTRIC CO. |
| To: | Martin R NRC OFFICE OF ADMINISTRATION (ADM), NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| IEB-85-001, IEB-85-1, KMLNRC-86-027, KMLNRC-86-27, NUDOCS 8602180225 | |
| Download: ML20153B986 (3) | |
Text
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KANSAS GAS AND ELECTRIC COMPANY THE ELECTAC COMPANY G L E P4 N L KOESTER
% d5 PRf 5' DENT 8euCLEAR February 11, 1986 Mr. R.D. Martin, Regional Administrator U.S. Eclear Regulatory Comission Region IV 611 Ryan Plaza Drive, Suite 1000 Arlington, Texas 76011 U.S. Nuclear Regulatory Conmission Document Control Desk Washington D.C.
20555 KMLNRC 86-027 RE:
Docket No. STN 50-482 SUBJ: Response to IE Bulletin 85-01 Gentlemen:
The pirpose of this letter is to provide a response for the Wolf Creek Generating Station (NCGS) to the subject Bulletin advising certain holders of Construction Pe mits and Operating Licenses of the possibility of inoperable auxiliary feedwater (AFW) punps due to steam binding.
The subject Bulletin requested licensees to take certain actions to reduce the possibility of steam binding in AFW punps.
The subject Bulletin requires that procedures be developed for nonitoring fluid conditions within the AFW system on a regular basis during times when the system is required to be operable.
At NCGS tenperature elements are provided at the top of the feedwater lines between the pmp discharge check valves and pump discharge flanges which indicate the tenperature on the Balance of Plant conputer.
Procedure STS CR-001, Revision 3, requires tenperature readings be taken once per shift to monitor fluid conditions while in modes 1, 2,
and 3.
STS CR-001 was approved Decenber 20, 1985.
Bulletin 85-01 also requires that procedures be developed for recognizing steam binding and for restoring the AFW system to operable status should' steam binding occur.
Procedure STS CR-001 recognizes the possibility of steam bindigg by nonitoring fluid tenperature. If the tenperature approaches 200 F procedure OFN 00-026, Revision 0, will be inplemented.
OFN 00-026 was developed to provide actions to be followed upon identification of possible steam binding of any AFW punp.
The affected AFW pump (s) will be inoperable during the performance of OFN 00-026. OFN 00-026 was approved Decenber 30, 1985.
[h 9602180225 860211 PDR ADOCK 05000482 G
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201 N. Market - Wichita, Kansas - Mail Address: Po. Box 208 I w1chita, Kansas 67201 - Telephone: Area Code (316)_261-6451
Mr. R.D. Martin Page 2 February 11, 1986 100mC 86-027 In addition to -the above mentioned administrative controls, the following design features at NCGS will minimize problems due to steam binding of APW punps:
- 1) There are three check valves in series between the main feedwater lines and the.AFW punps that are designed to prevent reverse flow to the APW punps.
- 2). '1he piping is not insulated from the AFW check valve at the main feedwater line to the punp discharge flange.
The exposed line should help winkidie any steam formed in the pipe.
- 3) The steam driven AFW punp mininum flow line tap is on the top of a line located 16" from the punp discharge flange. The miginum flow lines on the motor driven AFW punps are at 45 from vertical and 30" from the punp discharge flanges. These locations will help vent the steam to the condensate storage tank, should back leakage occur.
The.conbination of design features and administrative controls that.
are currently being taken reduces the probability for steam binding of-AFW pmps to an acceptable level.
Should steam binding occur adequate procedures are in place to recognize the situation and restore the AFW punps to an operable status. Administrative controls shall be kept in effect until coupletion of a hardware modification.to substantially reduce the likelihood of steam binding or until superseded by action implemented as a result of resolution of Generic Issue 93, " Steam Binding of Auxiliary Feedwater Punps".
Yours Very Truly, Glenn L. Koester Vice President - 141 clear Gm:see xc: PO'Connor JCunctins
STATE T KANSAS )
) SS CITY T WICHITA )
Glenn L. Koester, of lawful age, being first duly sworn upon oath says that he is Vice President - Nuclear and an Officer of Kansas Gas and Electric Conpany; that he has read the foregoing document and knows the content thereof; that he has executed that same for and on behalf of said Conpany with full power and authority to do so; and that the facts therein stated are true and correct to the best of his knowledge, information and belief.
BY Y_
Glenn L. Koester Vice President - Nulcear SUBSCRIBED and sworn to before me this l (* day of hg 1985.
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