ML20024B110

Startup Test Procedure 26,Relief Valves.

ML20024B110
Person / Time
Site:	LaSalle
Issue date:	06/24/1983
From:	COMMONWEALTH EDISON CO.
To:
Shared Package
ML20024B100	List: ML20024B099 ML20024B103 ML20024B104 ML20024B107 ML20024B109 ML20024B110 ML20024B111 ML20024B112 ML20024B115 ML20024B116 ML20024B119
References
PROC-830624-04, NUDOCS 8307050223
Download: ML20024B110 (2)

Text

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t STARTUP TEST PROCEDURE 26 RELIEF VALVES

1. PURPOSE A. The purpose of this test is as follows:

1. To verit; the proper operation of the primary system relief valves. '

2. To determine each relief valve's capacity.

3. To verify that the discharge piping is not blocked.

4. To verify that each relief valve rescats following operation.

5. To obtain a transient recorder signature of each relief valve operation for subsequent comparisons.

6. To confirm proper overall functioning of the Low-Low Set Pres-sure Relief Logic.

7. To verify proper safety / relief valve discharge line backpres-sure.

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2. CRITERIA Level 1.

A. There should be positive indication of steam discharge during the manual actuation of each valve.

B. The sum total of the percentage corrected flow rates must be greater than 111.5% of the Nuclear Boiler warranted steam flow at 103% of the spring setpoint pressure of 1165 psig.

C. The Low-Low Set Pressure Relief logic shall function to preclude subsequent simultaneous SRV actuations following the initial SRV '

actuation due to the original pressurization transient.

Level 2.

A. No observable leakage shall exist following reclosure.

B. The pressure regulator must satisfactorily control the reactor transient and'close the control and/or bypass valves by an amount equivalent to the relief valve steam flow.

8307050223 830624

{DRADOCK 05000373 PDR L

STP #26 Page 2 l

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l C. The transf nt recorder signatures for each valve must be analyzed for a relative system response comparison. The delay time (between trip and moticu)(shall be less thsn or equal -to 0.1 seconds, and the response ti:ne (main disk stroke time) shall be less than or equal to 0.15 seconds.

D. No individual relief valve may have a flow rate (corrected to the setpoint pressure) that, considering measurecent uncertainties, is

- less than 90%, or greater than 122.5%, of its expected flow rate of 862,400 lbs/hr at 103% of the spring setpoint. pressure of 1146 psig.

E. No more than 25% of the instalked relief valves nay have an individ-ual corrected flow rate that is.between 90% - 100% of their expected flow rates. [ ,

F. The total flow capacity of the safety relief valves used in the Automatig Depressurization System must be equal to or greater than 4.8 x 10 lbs/hr. at 1125 psig when the valve having the highest measured capacity is assumed to be out of s'ervice. - -

G. The selected MSRV with the highest nominal safety spring setting musts indicafe full open when manually actuated with its accumulator air supply isolated and vented.

H. Discharge line backpressure shall be comparable with information presented on the Nuclear Boiler Process Diagram.

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1. When the Low- Low Pressure Relief Jcgic functions, the open/close actions of the SRV's shall occur"within +13 psi and +20 psi of their

, design prints.respectively.

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3. RESULTS m . Test Condition 3.

An initial set of~ data was taken to define the relationship between bypass valve position and bypass valve flow. An additional, confirma-tory set of data will be taken during subsequent Test Condition 3 testing.

This data will then he used to determine relief valve capacities. No criteria were applicable to the testing already performed.

Further testing at this test condition will include relief valve capacity and timing measurements and low-low set relief logic verfication.

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