U-601107, Responds to NRC Re Plant Inservice Testing Program.Listed Valves in CRD Sys & Diesel Generator Subsystem Will Be Added to Inservice Testing Program.Encl Relief Requests Describe Testing for Valves

Responds to NRC Re Plant Inservice Testing Program.Listed Valves in CRD Sys & Diesel Generator Subsystem Will Be Added to Inservice Testing Program.Encl Relief Requests Describe Testing for Valves

ML20149F928
Person / Time
Site:	Clinton
Issue date:	02/10/1988
From:	Spangenberg F ILLINOIS POWER CO.
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
TAC-62989, U-601107, NUDOCS 8802180016
Download: ML20149F928 (9)

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U-601107 L30-88 02 -10 )-LP 1A.120

/LLIN0lB POWER COMPANY cLINToN Pontst $tAtICN P o. tot 478, ettNtoN. ILiiNois 61M7 February 10, 1988 Docket No. 50-461 Nuclear Rtgulatory Commission Document Control Desk Washington, D.C. 20555

Subject:

Clinton Power Station Inservice Testing Program

Dear Sir:

The letter to Frank Spangenberg fro'a Daniel R. Muller dated November 6, 1987, on the Clinton Power S;-!! n Inservice Testing Program (TAC No. 62989) requested a response on two items. Our response on these items follows:

1. The following valves in the Control Rod Drive (CRD) system vill be added to the Inservice Testing (IST) Programs check valves 114, 115, 138 and power operated valves 126, 127, and 139. There are 145 of each of these valves, one each per Hydraulic Control Unit.

The testing to be performed on these valves is as described in Relief Requests 2023-2025 (see attached). These relief requests essentially take credit for the testing required by the Technical Specifications and the Final Safety Analysis Report (FSAR).

The diesel generator subsystems have been reviewed and the following valves vill be added to the IST Program' Air Start Valves IDG008A-H, IDG008J. and 1DG008K; and air receiver check valves IDG168 to 1DG173. Relief request 2026 (see attached) describes the proposed testing for the air start valves. The check valves will be tested per the ASME Code.

2.Section XI requirements vill be met even if less restrictive requirements are imposed by Technical Specification. The affected valves are being tested in accordance with ASME Section XI. The Clinton Power Station Pump aid Valve Testing Program Plan vill be revised to incorporate these requirements. This revision is schedaled to be completed by March 1, 1988.

If you have any questions or comments on this information, please contact me.

Sincerely yours, 8802100016 880210 PDR ADCCK 05000461 =

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F. A. Spa .enb g. III Manager - Licensing and Safety k(1 I i Dw/bjg i Attachments

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CLINTON POWER STATION SECTION XI RELIEF REQUEST RELIEF REQUEST NO. 2023

' COMPONENT INFORMATION Valve 115 (typical of 145 each) is the control rod drive accumulator supply check valves refer to attached drawing. These are Category A/C -inch check valves. There valves allow the-individual accumulators to be charged with sufficient pressure to scram the appropriate control' rod drive upon loss of CRD header pressure. . With a-loss of header pressure, these valves must close to maintain enough pressure in the accumulator to insert the CRDs.

CODE REQUIREMENT Section ZI, Subarticle IWV-3521 requires check valves to be exercised to their safety position every three (3) months.

IWV-3420 requires Category A valves to be leak tested every 2 years to verify the component's ability to perform its safety function.

RELIEF REQUEST / JUSTIFICATION Illinois Power Company requests relief from the above Code requirements beccuse it is not feasible to individually exercise these valves without securing the CRD pumps. The reverse flow exercising and leakage tests of these check valves _will be satisfied by the performance of an accu.r.ulator pressure drop test, with the pumps secured, during refueling outages. This test will verify the valve is closed by monitoring the accumulator pressure which would indicate any leakage past the check valve.

ALTERNATE TESTING PROPOSED Illinois Power Company will satisfy the leakage and exercise tests for these valves upon performance of the accumulator pressure drop test on a refueling outage frequency.

Section XI/ISI/31

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ILLIN0IS POWER COMPANY CLINTON POWER STATION SECTION XI RELIEF REQUEST RELIEF REQUEST NO. 2024 COMPONENT INFORMATION Valves 126, 127 and 139 (typical of 145 each) are power operated valves which actuate (open) to scram the CRDs. Valve 114 (typical of 145 each) is the scram discharge check valve. Refer to attached drawing.

Valve information is as follows:

126 Power operated, Category B, 1" diaphram operated control valve. Valve opens to allow flow to scram the CRD.

127 Power operated, Category B, 3/4" diaphram operated control valve. Valve opens to allow flow to exhaust from the CRD to the scram discharge volume.

139 Power operated, Category B, Pilot Air Valve. Valve opens to relieve pressure to valves 126 and 127 which causes the valves to open.

114 Check valve, Category C, 3/4" check valve. Valve opens to allow flow to the scram discharge volume.

CODE REQUIREMENT ASME Section XI, Subarticles IWV-3411 and IWV-3413 require power operated valves to be exercised and stroke timed every 3 months.

IWV-3521 requires check valves to be exercised on a 3 month frequency.

l RELIEF REQUEST / JUSTIFICATION These valves operate simultaneously when a scram signal is l present. As these valves are skid mounted with no provisions for testing, it is not feasible to individually test each valve. The current testing, per Technical Specification 4.1.3.2, monitors individual rod scram time. This testing, although individual valve stroke time is not known, would assure that each valve stroked in sufficient time to allow the rod to move to its safety position in the required time, f ALTERNATE TESTING PROPOSED Testing of the control rod drive per Technical Specification 4.1.3.2 will be performed in lir; of the Code requirements. The Technical Specifications require all rods to be tested following any core alterations and any prolonged outages (120 days). Ten percent of the rods are tested on a rotating basis every 120 days and any rod is tested following maintenance.

Section XI/ISI/28

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ILLINOIS POWER COMPANY CLINTON POWER STATION SECTION XI RELIEF REQUEST RELIEF REQUEST NO. 2025 COMPONENT INFORMATION Valve 138 (typical of 145 each) is a %" Category C check valve on the CRD hydraulic control units. Valve 138 is the CRD cooling water check valve which must close upcn reverse flow to allow the 3 CRD to insert. Reverse flow through this check valve could impair the function of the CRD. See attached-drawing.

CODE REQUIREMENT Section XI, Subarticle IWV-3521 requires check valves to be exercised to their safety position every three (3) months.

RELIEF REQUEST / JUSTIFICATION Failure of these valves to reverse flow exercise would be identified by performing a "notch" test. The notch test is required per Technical Specification 4.1.3.1.2 which moves each withdrawn CRD one notch every 7 days and every 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> if one CRD is immovable as a result of friction. The failure of valve 138 would be decermined by the inability to meet the acceptance criteria of this surveillance. The CRD would "double-notch" if valve 138 did not properly exercise. A "double-notch" is where the CRD would not be able to move one notch at a time.

ALTERNATE TESTING Exercise valves by performing a "notch" test as described above (i.e., complying with Technical Specification 4.1.3.1.2).

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ILLINOIS POWER COMPANY CLINTON POWER STATION SECTION XI' RELIEF REQUEST RELIEF REQUEST NO. 2026

' COMPONENT INFORMATION Diesel generator.(DG) air start valves, 1DG008A-K are 1%" power operated Category B valves required to open to allow air to flow to the air motors to start the Emergency Diesel Generators.

CODE REQUIREMENT ASME Section XI, Subarticles IWV-3411 and IWV-3413 require power operated valves to be exercised and stroke timed every 3 months.

. RELIEF REQUEST / JUSTIFICATION There valves are totally enclosed valves with no positive means of determining valve position. Technical Specification 4.8.1.1.2 requires each DG to be tested at least every 31 days. These tests are designed to test the DG as a unit, not each component of the skid.

ALTERNATE TESTING PROPOSED No stroke timing of the air start valves will be performed. To satisfy the exercise test of these valves, the air gage upstream of each valve will be monitored to verify the pressure decrease in the line which assures the valve has opened. This test will be performed on a three month frequency.

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