NG-87-1881, Responds to Generic Ltr 87-06 Requiring List of All Pressure Isolation Valves W/Description of Periodic Testing Requirements & Operational Limits for Each Valve.Applicable Valves Listed.Testing Requirements Described

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Responds to Generic Ltr 87-06 Requiring List of All Pressure Isolation Valves W/Description of Periodic Testing Requirements & Operational Limits for Each Valve.Applicable Valves Listed.Testing Requirements Described
ML20215C248
Person / Time
Site: Duane Arnold NextEra Energy icon.png
Issue date: 06/11/1987
From: Mcgaughy R
IES UTILITIES INC., (FORMERLY IOWA ELECTRIC LIGHT
To: Murley T
NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM), Office of Nuclear Reactor Regulation
References
GL-87-06, GL-87-6, NG-87-1881, NUDOCS 8706180042
Download: ML20215C248 (3)


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Iowa Electric Light and Ihwer Company June 11,1987 NG-87-1881 Mr. Thomas E. Murley, Director Office of Nuclear Reactor Regulation Attn: Document Control Desk U. S. Nuclear Regulatory Commission Washington, D.C. 20555 l

Subj ect: Duane Arnold Energy Center Docket No: 50-331  !

Op. License No: OPR-49~

Periodic Testing of Leak Tight Integrity of 1

Pressure Isolation Valves (Generic Letter 87-06)

Reference:

1) letter from D. Vassallo (NRC) to L. Liu (Iowa Electric) dated September 26, 1983
2) Letter from R. McGaughy (Iowa Electric) to T. Murley (NRC), NG-87-1629, dated May 1,1987 File: A-10lb, A-105, A-107a, E-11

Dear Mr. Murley:

Generic Letter 87-06 requires that licensees submit a list of all pressure isolation valves with a description of the periodic testing requirements and operational limits for each of the valves to assure the integrity of the reactor coolant pressure boundary. The purpose of this letter is to provide the information requested in Generic Letter 87-06.

The Duane Arnold Energy Center (DAEC) currently has ten valves classified 4 as pressure isolation valves, as defined in Generic Letter 87-06. They are motor operated valves M0-2117, M0-2137, M0-1905, M0-2003, M0-1908 and M0-1909, and check v alves V-19-0149, V-20-0082, -V-21-072, and V-21-073.

Reference 1 required the DAEC to test the listed valves periodically in accordance with the Inservice Testing (IST) Program, which is based on the ASME Boiler and Pressure Vessel Code,Section XI, Subsection IWV. This requirement has remained in the DAEC IST Program through the current revision, submitted with Reference 2. Complete descriptions of the functions, testing requirements, and the operational limits associated with each of these valves are given in the following paragraphs.

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Mr. Thomas E. Murley

'NG-87-1881 June 11,1987 Page Two l

MO-2117 and M0-2137 are 8 inch motor operated gate valves which function as the outboard pressure isolation valves for the A and B Core Spray system injection lines. The valves are cycled quarterly or during cold shutdown, and are subjected to a hydrostatic seat leakage test during each refueling outage at a nominal differential pressure of 1000 psid. The allowable seat leakage rate is 4 gallons per minute (gpm). M0-2117 and M0-2137 are normally closed and are electrically interlocked such that they cannot be opened unless reactor pressure is less than 450 psig or the associated upstream isolation valves are closed.

V-21-072 and V-21-073 are 8 inch swing check valves that are located downstream of M0-2117 and M0-2137. They function as the inboard pressure isolation valves for the A and B Core Spray systen injection lines. The valves are verified to properly open and close, and are subjected to a hydrostatic seat leakage test at a nominal differential pressure of 1000 psid during each refueling outage. The allowable seat leakage rate is 4 gpm. There are no operational limits associated with these valves. )

M0-1908 and M0-1909 are 18 inch motor operated gate valves. They function as the inboard and outboard pressure isolation valves for the Residual Heat Renoval (RHR) systen pump suction line fran the B Reactor Recirculation loop.

The valves are normally closed and are opened only when the RHR system is being used in the shutdown cooling mode. M0-1908 and M0-1909 are cycled during cold shutdown, and are subjected to a hydrostatic seat leakage test at a nominal differential pressure of 1000 psid each refueling outage. The allowable seat leakage rate is 5 gpm. These valves are electrically interlocked such that they cannot be opened unless reactor pressure is less than 135 psig.

M0-2003 and M0-1905 are 20 inch motor operated gate valves which function as the outboard pressure isolation valves for the A and B Low Pressure Coolant l Injection (LPCI) lines. The valves are normally closed and are required to open I when the RHR system is used in the LPCI mode. M0-2003 and MD-1905 are cycled quarterly or during cold shutdown, and are subjected to a hydrostatic seat leakage test at a nominal differential pressure of 1000 psid during each ref ueling outage. The allowable seat leakage rate is 5 gpm. These valves are electrically interlocked such that they cannot be opened unless reactor pressure is less than 450 psig or the associated upstrean isolation valves are closed.

V-19-0149 and V-20-0082 are 20 inch swing check valves that are located downstream of M0-2003 and M0-1905. They function as the inboard pressure isolation valves for the A and B LPCI lines in the RHR system. V-19-0149 and V-20-0082 are verified to properly open and close, and are subjected to a hydrostatic seat leakage test at a nominal differential pressure of 1000 psid during each refueling outage. The allowable seat leakage rate is 5 gpm. There are no operational limits associated with these valves.

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- Mr. Thomas ' E. M' urley NG-87-1881 i June 11, 1987 j

Page Three Please note that~ Reference ~1 required similar testing of two additional motor operated valves (M0-1900 and M0-1901) in the RHR. system which then. .

functioned as the inboard and outboard isolation' valves for the RHR system head spray line. .However, during the Cycle 8/9 refueling outage, the Head Spray Mode of..the RHR system was . permanently disabled and. the head spray-line was blank fl anged . The valves were closed, retired in place, and electrical power was j removed from the associated motor controllers. Subsequently, M0-1900 and M0-1901 i

were removed from the IST- Program.

Should you have any questions regarding this' letter, please contact this.~ j office.

Very truly yours,

%% C Richard W. McGaughy ,

Vice-President,. Production -  !

RWM/NKP/gj*

cc: N. Peterson L. Liu '

A. Cappucci (NRC-NRR)

L. Root NRC Resident Office A. Bert Davis (NRC-Region III Office)

Commitment Control 870052