ULNRC-06109, Response to Request for Additional Information PR-03 and PR-05, Proposed Alternatives from ASME OM Code Pump and Valve Testing Requirements, and Withdrawal of Relief Request PR-05

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Response to Request for Additional Information PR-03 and PR-05, Proposed Alternatives from ASME OM Code Pump and Valve Testing Requirements, and Withdrawal of Relief Request PR-05
ML14092A324
Person / Time
Site: Callaway Ameren icon.png
Issue date: 04/02/2014
From: Maglio S
Ameren Missouri
To:
Document Control Desk, Office of Nuclear Reactor Regulation
References
TAC ME2786, TAC ME2788, ULNRC-06109
Download: ML14092A324 (10)
v • d • e


Text

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WAmeren MISSOURI Callaway Plant April2, 2014 ULNRC-061 09 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555-0001 10 CFR 50.55a Ladies and Gentlemen:

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

FACILITY OPERATING LICENSE NPF-30 RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION RE: PR-03 AND PR-05, PROPOSED ALTERNATIVES FROM ASME OM CODE PUMP AND VALVE TESTING REQUIREMENTS, AND WITHDRAWAL OF RELIEF REQUEST PR-05. (TAC NOS. MF2786 AND MF2788)

References:

1) ULNRC-06034 dated September 23, 2013 (ADAMS Accession No. ML13267A183)
2) NRC Letter, "Request for Additional Information Re: PR-03 and PR-05, Proposed Alternatives from ASME OM Code Pump and Valve Testing Requirements (TAC Nos. MF2786 and MF2788)," dated March 5, 2014 (ADAMS Accession No. ML14059A345)

Pursuant to 10 CFR 50.55a(a)(3), and by letter dated September 23, 2013, (Reference 1), Union Electric Company (Ameren Missouri) requested NRC approval of relief requests PR-01, PR-02, PR-03, PR-04, PR-05 and PR-06 for the fourth 10-year inservice testing interval at Callaway. By letter dated March 5, 2014 (Reference 2), the NRC staff transmitted a request for additional information (RAI) needed to complete its formal review of relief requests PR-03 and PR-05. PR-03 is a request to permit use of a test flow path for the boric acid transfer pumps, for which only differential pressure (in lieu of differential pressure and flow) will be measured but which would still provide an adequate means to assess pump performance. PR-05 is a request to increase the upper limit of the required action range for comprehensive pump test flow results from +3 percent to +6 percent, following the guidance of ASME OM Code Case OMN-19.

Ameren Missouri's response to the RAI is provided in the attachment to this letter.

PO Box 620 Fulton, MD 65251 AmerenMissouri.com STARS* Alliance

ULNRC-061 09 April 2, 2014 Page 2 It should be noted that, upon further consideration of relief request PR-05, Ameren Missouri has determined that it should be withdrawn. Therefore, by this letter, Ameren Missouri respectfully requests withdrawal of the relief request identified as PR-05. This request does not affect the other (5) relief requests (PR-01, PR-02, PR-03, PR-04 and PR-06) submitted via the September 23, 2013 letter.

This letter and its attachment do not contain new commitments. None of the material presented herein is considered proprietary by Ameren Missouri.

Please contact me at 573-676-8719 or Jim Kovar at 314-225-1478 for any questions you may have regarding this response.

Sincerely,

).A. W\)

S.A.Ma~

Regulatory Affairs Manager JPK/

Attachment:

Response to Request For Additional Information (RAI) Regarding Relief Requests PR-03 and PR-05, Proposed Alternatives from ASME OM Code Pump and Valve Testing Requirements

ULNRC-061 09 April 2, 2014 Page 3 cc: Mr. Marc L. Dapas Regional Administrator U.S. Nuclear Regulatory Commission Region IV 1600 East Lamar Boulevard Arlington, TX 76011-4511 Senior Resident Inspector Callaway Resident Office U.S. Nuclear Regulatory Commission 8201 NRC Road Steedman, MO 65077 Mr. Fred Lyon Project Manager, Callaway Plant Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Mail Stop 0-8B 1 Washington, DC 20555-2738

ULNRC-061 09 April 2, 2014 Page 4 Index and send hardcopy to QA File A160.0761 Hardcopy:

Certrec Corporation 4150 International Plaza Suite 820 Fort Worth, TX 76109 (Certrec receives ALL attachments as long as they are non-safeguards and may be publicly disclosed.)

Electronic distribution for the following can be made via Other Situations ULNRC Distribution:

F. M. Diya C. 0. Reasoner III D. W. Neterer L. H. Graessle B.L.Cox S. A. Maglio T. B. Elwood Corporate Communications NSRB Secretary STARS Regulatory Affairs Mr. John O'Neill (Pillsbury Winthrop Shaw Pittman LLP)

Missouri Public Service Commission

Attachment to ULNRC-06109 Page 1 Response to Request For Additional Information (RAI) Regarding Relief Requests PR-03 and PR-05, Proposed Alternatives from ASME OM Code Pump and Valve Testing Requirements RAI PR-03-1 The Request states that flow measuring instrumentation is not installed in the mini-flow recirculation flow path. Explain why flow measuring instrumentation cannot be installed in this flow path.

PR-03-1 Response:

This flowpath does not include permanently installed flow instrumentation and would require a costly system modification for such capability. The most suitable location for use of a temporary ultrasonic flow meter (UFM) has numerous small bore instrument lines interfering with the use of a ladder to reach the applicable Boric Acid Transfer piping. Callaway would also have to implement new and more costly calibration requirements on our UFM equipment.

RAI PR-03-2 Provide a pump curve for the Boric Acid Transfer Pumps. If the pumps are operating at 15 gpm, are they operating on a flat portion of the curve or a sloped portion of the curve? If they are operating on a flat portion of the curve, discuss how pump degradation can be detected from the proposed Group A test results if flow is not measured.

PR-03-2 Response:

Pump curves have been attached with this response. At 15 GPM the pump curves do exhibit some degree of slope/linearity, although not nearly as linear as the 75GPM bi-ennial CPT flow. The lack of flow measurement during quarterly testing does not prevent the detection of pump degradation. Because the throttle position of the applicable globe valve is administratively controlled, the flow rate for the quarterly testing is essentially a fixed value.

This is no different than a typical test scenario where flow is measured and adjusted to a fixed reference value.

RAI PR-05-1 There is confusion as to which pumps are affected by this alternative request. Section 1 states that the components affected by the proposed alternative are all of the pumps contained within the inservice testing program scope. Section 5 states that the proposed alternative is applicable to the pumps listed in Table PR-05. The pumps listed in Table PR-05 are all horizontal centrifugal pumps and vertical line shaft pumps. However, Section 3 lists as an applicable Code requirement ISTB-5323, "Comprehensive Test Procedure," which

Attachment to ULNRC-061 09 Page 2 is applicable to positive displacement pumps. Please state which section of the alternative request provides the correct listing of pumps, Section 1 or Section 5. If Section 5 is correct, please explain why ISTB-5323 is listed as an applicable Code requirement.

PR-05-1 Response:

Relief Request PR-05 is being retracted. No further NRC review is required.

RAI PROS-2 The NRC staff does not have an issue with Code Case OMN-19, provided that a Pump Periodic Verification Test Program is in place. This test program will insure that the pumps will be able to meet their design basis accident flow rates and differential pressures. Discuss why a Pump Periodic Verification Test Program is not included in the proposed alternative, as was done in alternative request P-6 for Surry Power Station Unit 1 and alternative request P-5 for Surry Power Station Unit 2. Mandatory Appendix V in the 2012 Edition of the ASME OM Code provides a Pump Periodic Verification Test Program that meets the NRC staff's concerns. Code Case OMN-19 and the 2012 Edition of the ASME OM Code are not yet endorsed in 10 CFR 50.55a.

PR-05-2 Response:

Relief Request PR-05 is being retracted. No further NRC review is required.

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