ML18003B070
| ML18003B070 | |
| Person / Time | |
|---|---|
| Site: | Harris  |
| Issue date: | 02/11/1985 |
| From: | Knighton G Office of Nuclear Reactor Regulation |
| To: | Utley E CAROLINA POWER & LIGHT CO. |
| References | |
| NUDOCS 8503080235 | |
| Download: ML18003B070 (11) | |
Text
Docket No.:
50-400 FEB 11 1985 Mr. E.
E. Utley, Executive Vice President Power Supply' Enginee'ring Im Construction Carolina Power 5 Light-Company P. 0.
Box 1551 Raleigh,'orth Carolina '7602 5
Dear Mr. Utley:
Subject:
Request for Additional.,Information on Containment Purge and Vent Valve Opet ability 5'5 Continued staff review of the Shearon Harris, Unit 1
OL application has resulted in the need for additional information, =as delineated in the enclosure, in the area of containment purge and vent valve operability.
Please inform the NRC Project Manger of your schedule for responding on this issue.
Sincerely, OAIGINAI.SIGNED BY
Enclosure:
As stated cc:
See next page DL G
hon 2/7/85 DISTRIBUTION
... 55-'loo NRC PDR Local PDR NSIC PRC System LB¹3 Reading JLee BBuckley
- Attorney, OELD DL:LB BBuckley/yt 2/7/85 NGrace EJordan ACRS (16)
George W. Knighton, Chief Licensing Branch No.
3 Division of Licensing 850308 QGK 0500040 0g35 8502<
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Shearon Harris Mr. E.
E. Utley Executive Vice Presi.dent Power Supply and Engineering and Construction Carolina Power 5 Light Company Post Office Box 1551 Raleigh, North Carolina 27602 George F. Trowbridge, Esq.
Shaw, Pittman, Potts 5 Trowbridge 1800 M Street, NW Washington, DC 20036 Richard E. Jones, Esq.
Associate General Counsel Carolina Power 5 Light Company 411 Fayetteville Street Mall Raleigh, North Carolina 27602 M. David Gordon, Esq.
Associate Attorney General State of North Carolina Post Office Box 629
- Raleigh, North Carolina 27602 Thomas S. Erwin, Esq.
115 W. Morgan Street
- Raleigh, North Carolina 27602 Mr. George Maxwell Resident Inspector/Harris NPS c/o U.S. Nuclear Regulatory Commission Route 1,
Box 315B New Hill, North Carolina 27562 Charles D. Barham, Jr.,
Esq.
Vice President 5 Senior Counsel Carolina Power 8 Light Company Post Office Box 1551 Raleigh, North Carolina 27602 Mr. John Runkle, Executive Coordinator Conservation Council of North Carolina 307 Granville Road Chapel Hill, North Carolina 27514 Mr. Wells Eddleman 718-A Iredel1 Street Durham, North Carolina 27705 Mr. George Jackson, Secretary Environmental Law Project School of Law, 064-A Univeristy of North Carolina
~ Chapel Hill, North Carolina 27514 Dr. Phyllis Lotchin 108 Bridle Run Chapel Hill, North Carolina 27514 Mr. Travis Payne, Esq.
723 W. Johnson Street Post Office Box 12643 Raleigh, North Carolina 27605 Mr. Daniel F.
Read CHANGE Post Office Box 2151
- Raleigh, North Carolina 27602 Bradley W. Jones, Esq.
U.S. Nuclear Regulatory Comm.
Region II 101 Marietta Street Atlanta, Georgia 30303 Richard D. Wilson, M. D.
725 Hunter Street Apex, North Carolina 27502 Regional Administrator - Region II U.S. Nuclear Regulatory Commission 101 Marietta Street Suite 3100 Atlanta, Georgia 30303 Mr. Robert P. Gruber Executive Director Public Staff -
NCUC Post Office Box 991 Raleigh, North Carolina 27602
Dr. Linda Little Governor's Waste Management Board 513 Albemarle Building 325 North Salisbury Street Raleigh, North Carolina 27611
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Operability gualification of Purge and Vent Valves Enclosure I
Attachment 1
Demonstration of operability of the containment purge and vent valves and the ability of these valves to close during a'esign basis accident is necessary to assure containment isolation.
This demonstration of operability is required by NUREG-0737, "Clarification of THI Action Plan Requirements,"
II.E.4.2 for containment purge and vent valves which are not sealed closed during operational conditions 1, 2, 'nd 4.
1.
For each purge and vent valve covered in the scope of this review, the following documentation demonstrating compliance with the "Guidelines "for Demonstration of Operability of Purge and Vent Valves" (attached, Attachment
- 85) is to be submitted for staff review:
A.
Dynamic Torque Coefficient Test Reports (Butterfly valves only) - including a description of the test setup.
B.
Operability Demonstration or In-situ Test Reports, (when used)
I C.
Stress Repo'rts D.
Seismic Reports for Valve Assembly (valve and operator) and associated parts.
E.
Sketch or description of each valve installation showing the following (Butterfly valves only):
l.
direction of flow 2.
disc closure direction 3.
curved side of disc, upstream or downstream (asymetric discs) 4.
orientation and distance of elbows, tees,
- bends, etc.
within 20 pipe diameters of valve 5.
shaft orientation 6.
distance between valves I
F.
Demonstration that the maximum combined torque developed by the valve is below the actuator rating.
2.
The applicant should respond to the "Specific Val've Type,guestions" (attached) which relate to his valve.
3-Analysis, if used, should be supported, by tests which establish torque coefficients of the valve at various angles.
As torque coefficients in butterfly valves are dependent on disc shape aspect ratio, angle of closure flow direction and approach flow, these things should be accurately represented during tests.
Specifically, piping installations (upstream and downstream of the valve) during the test should be repre-sentative of actual field installations.
For example, non-symetric approach flow from an elbow upstream of a valve can result in fluid dynamic torques of double the magnitude of those found for a valve with straight piping upstream and downstream.
4.
In-situ tests, when performed on a representative valve, should be performed on a valve of each sinze/type which is determined to represent the worst case load.
Morst case flow direction, for example, should be considered.
For two valves in series where the second valve is a butterfly valve, the effect of non-symetric flow from the first valve should be considered if the valves are'ithin 15 pipe diameters of each other.
- 5. If the applicant takes credit for closure time vs. the buildup of contain-ment pressure, he must demonstrate that the method is conservative with respect to the actual valve closure rate.
Actual valve closure rate is to be determined under both loaded and unloaded conditions and periodic inspection under tech.
spec.
requirements should be performed to assure closure rate does not increase with time or use.
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Specific Yalve Type guestions The following questions apply to specific valve types only 'and need to be answered only where'pplicable.
If not applicable, state so.
A.
Torque Due To Containment Backpressure Effect (TCB)
For those air operated valves located inside containment, is the operator design of a type that can be affected by the containment pressure rise (backpressure effect) i.e. where the containment pressure acts to reduce the operator torque capability due to TCB.
Discuss the operator design with respect to the air vent and bleeds.
Show how TCB was calculated (if applicable).
B.
Mhere air operated valve assemblies use accumulators as the'fail-safe
- feature, describe the accumulator air system configuration and its oper-ation.
Discuss active electrical. components in the accumulator
- system, and the basis used to determine their qualification for the environmental conditions experienced.
Is this system seismically designed2 How is the allowable leakage from the accumulators determined and monitored.
.C.
D.
E.
For valve'ssemblies requiring a seal pressurization system (inflatable main seal), describe the air pressurization system configuration and operation including means used to determine that valve closure and seal pressurization have taken place.
Discuss active electrical components in
.this system, and the basis used to determine their qualification for the environmental condition experienced.
Is this system seismically designed2
~Mhere electric motor operators are used to close the valve has the minirwm available voltage to the electric operator under both normal or emergency modes been determined and specified to the operator manufacturer to assure the adequacy of the operator to stroke the valve at accident conditions with these lower limit voltages available2 Does this reduced voltage operation, result in arp significant change in stroke timing2 Describe the'emergency mode po~er source used.
Mhere electric motor and air operator units are equipped with handwheels,,
does their design provide for automatic re-engagement of the motor operator following the handwheel mode of.
operation?'f not,'what steps are taken to preclude the possibility of the bivalve being left in the handwheel mode following some maintenance, test etc. type operation?
F.
For electric motor operated valves have the torques developed during operation been found to be less than the torque limiting settings'
h tnclosure I
Attachment 2
GUIDELINES FOR DEMONSTRATION OF OPERABILITY OF PURGE AND VENT VALVES OPERABILITY In order to establish operability it must be shown that the valve actuator's torque capability has sufficient margin to overcome or resist the torques and/or forces (i.e., fluid dynamic, bearing, seating, friction) that resist closure when..stroking from the initial open position to full'seated (bubble tight) in the time limit specified.
This should be predicted on the pressure(s) established in the containment following a design basis LOCA.
Considerations which should be addressed in assuring valve design adequacy include:
l.
Valve closure rate versus time - i.e., constant rate or other.
2.
Flow direction through valve; hP across valve.
3.
Single valve closure (inside containment or outside containment valve) or simultaneous closure.
Establish worst. case.
4.
Containment back pressure effect on closing torque margins of air operated valve which vent pilot air inside containment.
5.
Adequacy of accumulator (when used) sizing and initial charge for valve closure requirements.
6.
For valve operators using torque limiting devices - are the settings of the devices compatible with the torques required to operate the valve during the design basis condition.
7.
The effect of the piping system (turns, branches) upstream and downstream
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of all valve installations.
8.
The effect of butterfly valve disc and shaft orientation to the fluid mixture egress ing from the containment.
DEMONSTRATION Demonstration of the various aspects of operability of purge and vent valves may be by analysis, bench testing, insitu testing, or a combination of these means.
Purge and vent valve structural elements (valve/actuator assembly) must be evaluated to have sufficient stress margins to withstand loads imposed while valve closes during a design basis accident.
Torsinnal shear,
- shear, bending, tension and compression loads/stresses should be considered.
Seismic loading should be addressed.
Once valve closure and structural integrity are assured by analysis,. testing or a suitable combination, a determination of the sealing integrity after closure and long term exposure to the containment environment should be evaluated.
Emphasis should be directed at, the effect of radiation and of the containment spray chemical solutions on seal material.
Other aspects such as the effect gn sealing from outside ambient temperatures and debris should be considered.
/
The following considerations apply when testing is Chosen as a means for demonstrating valve operability:
Bench Testin A.
Bench testing can be used to demonstrate suitability of the in-service valve by reason'of its 'traceability in design to a test valve.
The following factors should be considered when qualifying valves through bench testing.
l.
Whether a valve was qualified by testing of an identical valve assembly or by extrapolation of data from a similarly designed valve.
2.
Whether measures were taken to assure that pi'ping upstream and down-stream and valve orientation are simulated.
3.
Whether the following load and environmental factors were considered a.
Simulation of LOCA b.
Seismic lodding c.
Temperature soak d.
Radiation exposure e.
Chemical exposure d.
Oebris B.
Bench testing of installed valves to demonstrate the suitability of the specific valve to perform its required function during the postulated design basis accident is acceptable.
1.
The factors listed in items A.2 and A.3 should be considered when taking this approach.
In-Situ Testin ln-situ testing of purge and vent valves may be performed to confirm the suitability of the valve under actual conditions.
When performing such tests, the conditions (loading, environment) to which the valve(s) will be subjected during the test should simulate the design basis accident.
NOTE:
Post test valve examination shou'Id be performed to establish structural integrity of the key valve/actuator components..
Mr. E.
E. Utley Executive Vice President Power Supply and Engineering and Construction Carolina Pnwer
& Light Company Post Office Box 1551 Raleigh, North Carolina 27602 George F. Trowbridge, Esq.
Shaw, Pittman, Potts
& Trowbridge 1800 M Street, NW Washington, DC 20036 Richard E. Jones, Esq.
Associate General Counsel Carolina Power
& Light Company 411 Fayetteville Street Mall Raleigh, North Carolina 27602 M. David Gordon, Esq.
Associate Attorney General State of North Carolina Post Office Box 629 Raleigh, North Carolina 27602 Thomas S. Erwin, Esq.
115'W.
Morgan Street
- Raleigh, North Carolina 27602'r.
George Maxwell Resident Inspector/Harris NPS c/o U.S. Nuclear Regulatory Commission Route 1,
Box 315B New Hill, Nor th Carolina 27562 Charles D. Barham, Jr.,
Esq.
Vice President
& Senior Counsel Carolina Power
& Light Company Post Office Box 1551 Raleigh, North Carolina 27602 Mr. John Runkle, Executive Coordinator Conservation Council of North Carolina 307 Granville Road Chapel Hill, North Carolina 27514 Mr. Wells Eddleman 718-A Iredell Street Durham, North Carolina 27705 Shearon Harris Mr. George Jackson, Secretary Environmental Law Project School of Law, 064-A Univeristy of North Carolina Chapel Hill, North Carolina 27514 Dr. Phyllis Lotchin 108 Bridle Run Chapel Hill, North Carolina 27514 Mr. Travis Payne, Esq.
723 W. Johnson Street Post Office Box 12643
- Raleigh, North Carolina F7605 Mr. Daniel F.
Read CHANGE Post Office Box 2151
- Raleigh, North Carolina 27602 Bradley W. Jones, Esq.
U.S. Nuclear Regulatory Comm.
Region II 101 Marietta Street Atlanta, Georgia 30303 Richard D. Wilson, M. D.
725 Hunter Street Apex, North Carolina 27502 Regional Administrator - Region II U.S. Nuclear Regulatory Commission 101 Marietta Street Suite 3100, Atlanta, Georgia 30303 Mr. Robert P. Gruber Executive Director Public Staff -
NCUC Post Office Box 991
- Raleigh, North Carolina 27602
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Or. Linda Little Governor's Waste Management Board 513 Albemarle Building 325 North Salisbury Street Raleigh, North Carolina 27611