ULNRC-04966, Union Electric Co., Supplement to Response to NRC Bulletin 2003-01, Potential Impact of Debris Blockage on Emergency Sump Recirculation at Pressurized-Water Reactors.

Union Electric Co., Supplement to Response to NRC Bulletin 2003-01, Potential Impact of Debris Blockage on Emergency Sump Recirculation at Pressurized-Water Reactors.

ML040920379
Person / Time
Site:	Callaway
Issue date:	03/25/2004
From:	Keith Young Union Electric Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
ULNRC-04966
Download: ML040920379 (5)

Text

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AmerenUE PO Box 620 CallawayPlant Fulton, MO 65251 March 25, 2004 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Mail Stop P1-137 Washington, DC 20555-0001 ULNRC-04966 wAmereR Ladies and Gentlemen:

UE DOCKET NUMBER 50-483 CALLAWAY PLANT UNIT 1 UNION ELECTRIC CO.

FACILITY OPERATING LICENSE NPF-30 SUPPLEMENT TO RESPONSE TO NRC BULLETIN 2003-01, "POTENTIAL IMPACT OF DEBRIS BLOCKAGE ON EMERGENCY SUMP RECIRCULATION AT PRESSURIZED-WATER REACTORS" Ref: ULNRC-04884, dated August 8, 2003 This letter transmits changes to the Union Electric Company (AmerenUE) NRC bulletin 2003-01 response and regulatory commitments contained in the reference.

This supplement is being submitted in accordance with guidance provided by industry document NEI 99-04, "Guidelines for Managing NRC Commitment Changes," as endorsed in Regulatory Issue Summary 00-017, "Managing Regulatory Commitments Made by Power Reactor Licensees to the NRC Staff."

The reference contained a commitment to conduct an inspection to confirm that there are no adverse gaps or breaches in the sump screens. This commitment also contained the acceptance criteria of no larger than 1/8 inch for the inner screen and no larger than 1/2 inch for the middle screen.

AmerenUE is not changing the portion of the commitment related to conducting the inspection, but has modified the inspection acceptance criteria by adding acceptable tolerances to each criterion associated with breaches in the sump screens. Prior to plant restart following the spring, 2004 refueling outage, Callaway will perform an inspection to verify that there are no gaps or breaches larger than 1/8 +/- 1/16 inch in the inner sump screen and no larger than 1/2 +/- 1/8 inch in the middle sump screen.

Inspection findings will be evaluated using acceptance criteria contained in plant design documents and any deficiencies identified will be entered into the plant work control and corrective action program to report and resolve the identified deficiency.

a subsidiary of Ameren Corporation

ULNRC-04966 March 25, 2004 Page 2 In addition, AmerenUE is revising its response to Bulletin 2003-01 contained in the reference. In response item 1, bullet 1, the use of Essential Service Water (ESW)

System via drain to containment recirculation sump as an alternative water source is being deleted. Further reviews by Callaway Engineering and Operations Departments have concluded that this method is not a practical option for providing additional inventory to inject into the reactor core or spray into the containment atmosphere.

If you have any questions regarding this submittal, please contact me at (573) 676-8659 or Mr. Dave Shafer, Superintendent - Licensing at (314) 554-3104.

Sincerely, Keith D. Young Manager - Regulatory Affairs Attachments: I Affidavit II List of Commitments

-4 ULNRC-04966 March 23, 2004 Page 3 cc: U.S. Nuclear Regulatory Commission (Original and 1 copy)

Attn: Document Control Desk Mail Stop P1-137 Washington, DC 20555-0001 Mr. Bruce S. Mallett Regional Administrator U.S. Nuclear Regulatory Commission Region IV 611 Ryan Plaza Drive, Suite 400 Arlington, TX 76011-4005 Senior Resident Inspector Callaway Resident Office U.S. Nuclear Regulatory Commission 8201 NRC Road Steedman, MO 65077 Mr. Jack N. Donohew (2 copies)

Licensing Project Manager, Callaway Plant Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Mail Stop 7E1 Washington, DC 20555-2738 Missouri Public Service Commission Governor Office Building 200 Madison Street PO Box 360 Jefferson City, MO 65102-0360

ULNRC-04966 Attachment I Page 1 of I a .9 NOTE .R..

STATE OF MISSOURI ) SEAL

) SS PUBLIC COUNTY OF CALLAWAY)

Keith D. Young, of lawful age, being first duly sworn upon oath says that he is Manager, Regulatory Affairs for Union Electric Company; that he has read the foregoing document and knows the content thereof; that he has executed the same for and on behalf of said company 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 4e X9#OI Keith D.oung Manager, Regulatory Affairs SUBSCRIBED and sworn to before me this a3day of '1Qa rik. , 2004.

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ULNRC-04966 Attachment II Page 1 of 1 LIST OF COMMITMENTS The following table identifies those actions committed to by AmerenUE in this document.

Any other statements in this document are provided for information purposes and are not considered commitments. Please direct questions regarding these commitments to Mr.

David E. Shafer at (314) 554-3104.

COMMITMENT Due Date/Event Accessible sump screen surfaces will be inspected to confirm that Prior to plant the sump enclosure boundaries formed by the middle screens, restart following gratings, and miscellaneous structural steel have no openings that the spring, 2004 are larger than 1/2 +/- 1/8 inch, or for boundaries formed by the refueling outage.

inner screens, gratings, and miscellaneous structural steel that there are no openings larger than 1/8 +/- 1/16 inch. Inspection findings will be evaluated using acceptance criteria contained in plant design documents and any deficiencies identified will be entered into the plant work control and corrective action program to report and resolve the identified deficiency.