ML062490502

Supplement to Response to NRC Generic Letter 2003-01, Control Room Habitability.

ML062490502
Person / Time
Site:	Palo Verde
Issue date:	08/28/2006
From:	Mauldin D Arizona Public Service Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
10205556-CDM/SAB/GAM, GL-03-001
Download: ML062490502 (3)

Text

NRC Generic Letter 2003-01 LAM David Mauldin Mail Station 7605 Palo Verde Nuclear Vice President Tel: 623-393-5553 PO Box 52034 Generating Station Nuclear Engineering Fax: 623-393-6077 Phoenix, Arizona 85072-2034 10205556-CDM/SAB/GAM August 28, 2006 Attn: Document Control Desk U.S. Nuclear Regulatory Commission Washington, DC 20555-0001

Subject:

Palo Verde Nuclear Generating Station (PVNGS)Units 1, 2 and 3 Docket Nos. STN 50-528, 50-529, and 50-530 Supplement to Response to NRC Generic Letter 2003-01, "Control Room Habitability" By letter no. 102-05018, dated December 5, 2003, Arizona Public Service Company (APS) submitted to the NRC a 180-day response to NRC Generic Letter (GL) 2003-01,"Control Room Habitability." In that response, APS provided the results of PVNGS Unit 2 control room habitability tracer gas inleakage testing which confirmed that the control room habitability (CRH) system met the design basis requirement.

By letter no. 102-05312, dated July 19, 2005, APS committed to perform tracer gas testing in PVNGS Units 1 and 3. The tests were completed in August 2005. The testing was performed in accordance with ASTM Standard E741. The test results confirmed that unfiltered inleakage into the control room envelope in Units 1 and 3 was below the 61 cubic feet per minute (CFM) maximum inleakage to meet control room habitability design basis and regulatory requirements.

Mr. Mel Fields, NRC Senior Project Manager for PVNGS, requested that APS submit the results of the Units 1 and 3 tracer gas tests to the NRC using a similar tabular format as provided in APS' December 5, 2003, submittal showing the Unit 2 results. In response to that request, the Units 1 and 3 results are provided on the following table.A member of the STARS (Strategic Teaming and Resource Sharing) Alliance Callaway

• Comanche Peak

• Diablo Canyon

• Palo Verde

• South Texas Project a Wolf Creek ATTN: Document Control Desk U.S. Nuclear Regulatory Commission Supplement to Response to NRC Generic Letter 2003-01,"Control Room Habitability" Page 2 Units I and 3 Tracer Gas Testing Results, August 2005 Unit I Unit 3 Train "B" Outside Air Flow 780 +/- 11 scfm 735 +/- 10 scfm Train "B" Recirculation Flow Not Measured'1) Not Measured(1)Train "B" Isolation Flow Not Measured')

Not Measured')

Train "A" Outside Air Flow 592 +/- 35 scfm 666 +/- 11 scfm Train "B", Total Inleakage from 792 +/- 11 scfm 735 +/- 10 scfm Constant Injection Train "B" Concentration Decay Test 5 + 15 scfm(2) 5 +/- 15 scfm(2)Train "B" CRE Inleakage, (Constant 12 + 11 scfm(2) 0 +/- 10 scfm(2)Injection

-Outside Air Flow)Train "A" Total Inleakage from 596 +/- 35 scfm 666 +/- 11 scfm Constant Injection Train "A" Concentration Decay Test 2 +/- 6 scfm(2) 0 +/- 30 scfm(2)Train "A" CRE Inleakage, (Constant 4 + 35 scfm(2) 0 +/- 11 scfm(2)Injection

-Outside Airflow)CRE Volume Estimate from "PUFF" 189,019 +/- 2522 ft 3 189,325 +/- 2939 ft 3 Test (1) Recirculation and Isolation air flowrates for the system were not measured in Units 1 and 3 because they were not utilized to determine unfiltered inleakage.

(2) Acceptance criteria for unfiltered inleakage is less than or equal to 61 scfm, which includes 10 scfm for ingress and egress (calculation 13-NC-ZY-287, Revision 1, August 2002).

ATTN: Document Control Desk U.S. Nuclear Regulatory Commission Supplement to Response to NRC Generic Letter 2003-01,"Control Room Habitability" Page 3 No commitments are being made to the NRC by this letter. If you have any questions, please contact Thomas N. Weber at (623) 393-5764.Sincerely, CDM/SAB/GAM/

cc: B. S. Mallett NRC Region IV Regional Administrator M. B. Fields NRC NRR Project Manager G. G. Warnick NRC Senior Resident Inspector for PVNGS