ML20215E349

Responds to Generic Ltr 87-06 Re Periodic Verification of Leak Tight Integrity of Pressure Isolation Valves. Info Provided Includes Listing of Pressure Isolation Valves & Description of Testing Done to Verify Integrity

ML20215E349
Person / Time
Site:	Monticello
Issue date:	06/01/1987
From:	Musolf D NORTHERN STATES POWER CO.
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
GL-87-06, GL-87-6, NUDOCS 8706190341
Download: ML20215E349 (4)

Text

a 1

Northern States Power Company I

414 Nicollet Mall Minneapohs. Minnesota 55401 Telephone (612) 330-5500 June 1, 1987 l

US Nuclear Regulatory Commission Generic Letter 87-06 Attn: Document Control Desk Washington, DC 20555 MONTICELLO NUCLEAR GENERATING PLANT DOCKET No.

50-263 LICENSE NO. DPR-22 Response to Generic Letter 87-06, " Periodic Verification of Leak Tight Integrity of Pressure Isolation Valves" In response to Generic Letter 87-06, the following information is provided for the Monticello Nuclear Generating Plant:

l A listing of pressure isolation valves.

Description of testing done to verify integrity of the valves.

Testing frequencies and acceptance criteria for leakage.

LISTING OF PRESSURE ISOLATION VALVES (PIV)

A review of the Piping and Instrument Diagrams and the Monticello Section XI Inservice Testing Manual was performed to identify valves that meet the criteria for PIV's specified in the Generic Letter. Valves that meet this criteria are J

located in the following penetrations in the reactor coolant pressure boundary. '

- Core Spray Injection - 2 penetrations Low Pressure Coolant Injection (LPCI) - 2 penetrations

- Shutdown Cooling Supply - 1 penetration j

- Head Spray Supply - 1 penetration These valves are listed in Table 1 along with the valve type and penetration configuration (refer to Figure 1).

Other isolation valves in lines that communicate with the high pressure primary system, specifically the HPCI and RCIC injection isolation valves, were not listed since they do not form a boundary between the reactor coolant system and a low pressure system.

8706190341 870601 0[

PDR ADOCK 05000263 P

PDR

\\

6 Northem States Power Company Generic Letter 87-06 June 1, 1987 Page 2 TESTING OF_P,RESSURE ISOLATION VALVES Leakage rate testing of PIV's is performed in accordance with the requirements of ASME Section XI, Para. IWV-3420. There tests consist of hydrostatic tests

)

of the valves and are.done at reactor operating pressure. Per the requirements l

of Section XI, these tests are performed each refueling outage and also if any j

maintenance is done on the valves that may adversely affect their leakage per-j formance. The allowable leakage rate specified in the tests is 0.5 gpm.

In addition to the Section XI leak rate tests, the motor-operated valves listed above are also tested in accordance with Appendix J of 10CFR50. The testing frequency is the same as that for the Section XI tests. These tests are pneumatic tests performed at a minimum pressure of 42 psig. The acceptance j

criteria'for leakage is 17.2 SCFH.

These tests provide additional assurance that the valves will not leak excessively.

Please contact us if you have any questions related to the information provided.

Oa

' o %.

David Musolf Manager Nuclear Support Services Attachment c: NRR Project Manager, NRC Resident Inspector, NRC G Charnoff I

j

\\

l; j

j TABLE 1 PRESSURE ISOLATION VALVES 1

-1 l

i j

Penetration Valve #

Valve Description Valve Type Config Type

)

AO-14-13A A Core Spray Injection-Testable Check 1

j Check ll AO 14-13B B Core. Spray Injection Testable Check 1

Check-

]

MO 1753 A Core Spray Injection Motor-Operated 1

Isolation Gate Valve MO 1754 B Core' Spray Injection-Motor-Operated.

1 Isolation Gate Valve sAO.10-46A A LPC1 Injection Check Testable Check 1

AO 10-46B B-LPCI Injection Check

. Testable Check 1

MO 2014 A.LPCI Injection Isolation Motor-Operated 1

Gate Valve MO-2015 B LPCI Injection Isolation Motor-Operated 1

Gate Valve MO 2026 Head Spray Outboard Motor-Operated 2

Isolation Gate Valve MO 2027 Head Spray Inboard Motor-Operated 2

Isolation Gate Valve MO 2029 Shutdown Cooling Motor-Operated 2

Supply Inboard Isolation Gate Valve MO 2030 Shutdown Cooling Motor-Operated 2

Supply Outboard Isolation Gate Valve

FIGURE 1 PENETRATION CONFIGURATIONS TYPE 1 PC AO MO @ MOg 3,RHR OR

)

RCS,

, s, @

A v'

g

' CORE SPRAY 1

/

SYS RC PB ->

H P PIPING -><-L P PIPING a

1 Testable Check Valve.

2 Motor-Operated Gate Valve, Normally Closed.

g 3

Motor-operated valve, Normally Open.

This valve is not considered a pressure isolation valve but would be available for isolation purposes.

TYPE 2 l

PC MO g: RHR SYS MO RCS;

'; g bd i

RC PB +

HP PIPING

LP PIPING 1

Motor-Operated Gate Valve.

2 Motor-operated Gate Valve.

Abbreviations HP High Pressure LP Low Pressure PC Primary Containment RCPB Reactor Coolant Pressure Boundary RCS Reactor Coolant System