ML20210E343

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Forwards Addl Info on TMI Action Plan Item II.K.3.28, Qualification of Automatic Depressurization Sys Accumulators, Per NUREG-0737 & 861205 Request
ML20210E343
Person / Time
Site: Fermi DTE Energy icon.png
Issue date: 02/06/1987
From: Agosti F
DETROIT EDISON CO.
To:
NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
RTR-NUREG-0737, RTR-NUREG-737, TASK-2.K.3.28, TASK-TM TAC-57543, VP-NO-87-0025, VP-NO-87-25, NUDOCS 8702100284
Download: ML20210E343 (6)


Text

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February 6,1987 VP-NO-87-0025 U. S. tbclear Regulatory Ccenission Attn: Document Control Desk Washington, D. C. 20555

References:

1) Fermi 2 NIC Docket No. 50-341 NBC License No. NPF-432
2) Fermi 2 Final Safety Analysis Report Amendment No. 33
3) NBC to Detroit Edison Ietter dated December 5,1986 regarding 'IMI Action Plan Item II.K 3.28, " Qualification of ADS Accunulators" (NUREG-0737)

Subject:

Additional Information Related to 'IMI Action Plan Item II.K.3.28, " Qualification of ADS Accunclators" (NUREG-0737)

In response to your request for information contained in Reference 3) above, enclosed please find additional itemized information on the ADS Accunulators.

If you have any questions, please contact Mr. Girija Shukla at (313) 586-4072.

, Sincerely, "Vh [}

Attachment cc: Mr. E. Greenman Mr. W. G. Rogers Mr. J. J. Stefano

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. . 'b Attachment to VP-NO-87-0025 y Page 1 i ATTACIMENT Additional Information on ADS Accunulators Detroit B51 son Resoonse to NIC Ouestions s

1) Question Based on the requirements of NUREG-0737 Item II.K.3.28, it is necessary to demonstrate that the ADS valves, accunulators, and associated equipment and instrumentation meet the requirements specified in the plant FSAR and are capable of performing their functions during and following exposure to hostile environments, taking no credit for non-safety-related equipment or -

instrumentation. Additionally, air (or nitrogen) leakage throw 3h the valves nust be accounted for to assure that enough inventory of conpressed gas is available to cycle the ADS valves. If this cannot be demonstrated, it nest be shown that the scunnlator design is still acceptable. Since this system is a part of the energency core cooling system, it nust still perform its function for the long-term period of 100 days following an accident.

You are requested to address in detail (a) how you meet this long-term capability requirenent of 100 days following an accident or (b) the justification as to why a shorter time frame is sufficient long-term capability for your plant, or (c) provide a commitment and schedule for upgrading to the 100 day long-term capability requirement.

Response

The ADS valve accunulators and associated equipment are designed to neet the requirenents specified in the FSAR. Consideration of leakage from the accunulators and velve operators has been given in the sizing of the accunulators. The accunulators are not ,

designed to neet the long term capability requirenent of 100 days following an accident. However, a fully qualified pneumatic supply system, backed up by a qualified nitrogen bottle connection and the safety related non interruptible control air systen, has been provided to the ADS accunulators to neet this criteria.

2) Question Define the number of times the ADS pneumatically controlled valve is capable of cycling using only the accunulator inventory at atsnospheric pressure and at a specified percent (i.e., 70%) of drywell pressure, and the length of time these accunnlators are capable of performing their function following an accident.

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, VP-NO-87-0025

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Response

6, Each ADS accusulator has sufficient inventory to allow for five e

valve operations. . 'the accunnlators and the backup systems are .

designed to perform their required function during and following an accident.

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3) Question a

( J Describe the ADS accunulator system design and operation (e.g.,

trains, air supply, capacity, alarns and instrunentation and -

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^ Si their location, etc.)

Response Q 0- 2, ADS accumulator system design and operational details are given in the EF2 FSAR sections Q.2.2.2.3 and 6.3.2.2.2.

4) Question '

! Define the basis for the allowable leakage criteria for the ADS 9x '

accuruhtor system (e.g., boundary conditions, environnental and seisidly; parameters, operator int _erface, margin, etc.) .

[ I Response No allowab)e leakage criteria is used for the ADS Accumulator system, however, normal leakage from the ADS accunalator system is negligibly small, 0.016 scfm ors 0.08 percent of supply per minute, and'the accumulators are designed to account for such leakage.

5) Questien[

What' margin is in the allowable leakage criteria to account for possible increase in leakage in the ADS accunnlator system

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resulting from effects of a harsh environment and/or a seismic y event?

i #88ponse No margin has been considered since no allowable leakage criteria is used for the ADS accunnlator ystem.

2 N 6) Question A statement that test and/or analysis performed verified that a

.. harsh environment and/or seismic event would not increase the leakage rate in the ADS accuuulator system.

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Attachnent to VP-NO-87-0025 Page 3

Response

'the ADS accunnlator system has been analyzed to be capable of performing its design function during and following exposure to a harsh environnent and/or a seismic event.

7) Question A statenent that verifies that no credit was taken for non-safety-related equipment and instrumentation when establishing the allowable leakage criteria for the ADS accunolator system.

Response

No credit has been taken for non-safety related equipment and instrumentation to account for any. leakage.

6) 9wption Irovide a concise description of the tests performed on the ADS accunnlator system, and backup, and their frequency.

Response

Please see response to Question 9)

9) Question Provide a concise description of the surveillance performed, and how frequent, on alarus and instrunentation associated with the ADS accunulator system and backup system.

Response

A channel functional test is performed every thirty-one days on the low pressure alarm for the pneumatic supply to the ADS accumulators and a system functional test is performed once per 18 months. Both tests are required by section 4.5.1.d of the Plant 'Ncinical Specifications.

10) Question Provide a stataaent that confirns that the ADS accunulator system, backup system and associated equipnent and control circuitry, are seismically qualified.

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Attar h==1t to VP-!O-87-0025 Page 4

Response

The ADS accunnlator systen, backup system, and associated equipment are designed to function during and/or after a seismic event.

11) Question Provide a statement that confirns that the ADS accumulator system, backup system, and associated equipment and control circuitry are environmentally qualified for conditions associated with normal operation, maintenance, testing, and postulated accidents.

Response

The ADS accunnlator system, backup systen, and associated equipment and control are environnentally qualified.

12) Question Provide a statement verifying that the ADS valves, accuuulators, backup system, associated equipnent and instrumentation are capable of performing their function during and following an accident situation while taking no credit for non-safety-related equipment and instrumentation.

. Response The ADS valves, accunulators, backup systan, and associated equipment and instrunentation do not take credit for non-safety related equipment and instrumentation for performing their function during or following an accident.

13) Question

, Provide excerpts from the plants technical specification verifying that they specify the following:

ADS leak test frequency.

Allowable leakage rate.

Actions to be taken, in a specified tine frame should the leakage rate be exceeded.

Attachment to VP-NO-87-0025 Page 5

Response

Because of the additional backup systesa available to the ADS accumulators, the Plant Technical Specifications do not include the requirement specified in this question.

14) Question Provide a concise description of the design and operation of the backup system and confirm that it will neet the overall J

requirement of the ADS system following an accident.

Pesponse The description of the design and operation of the backup system is given in the EP2 FSAR section 5.2.2.2.3.

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