ML20058E197
| ML20058E197 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 07/23/1982 |
| From: | Devincentis J PUBLIC SERVICE CO. OF NEW HAMPSHIRE, YANKEE ATOMIC ELECTRIC CO. |
| To: | Miraglia F Office of Nuclear Reactor Regulation |
| References | |
| SBN-299, NUDOCS 8207280092 | |
| Download: ML20058E197 (14) | |
Text
PUBLIC SERVICE SMOM SWION Engineedng Omce.
Companyof NewHampshre 1671 Worcester Road Framinoham, Mossochusetts 01701 (617) - 872 - 8100 July 23, 1982 SBN-299 T.F. B 7.1.2 United States Nuclear Regulatory Commission Washington, D. C. 20555 Attention:
Mr. Frank J. Miraglia, Chief Licensing Branch No. 3 Division of Licensing
References:
(a) Construction Permit CPPR-135 and CPPR-136, Docket Nos. 50-443 and 50-444 (b) USNRC Letter, dated May 6, ISE2, " Request for Additional Infomation (Equipment Qualification Branch)," F. J. Miraglia to W. C. Tallman
Subject:
Response to 271 Series RAIs; (Equipment Qualification Branch)
Dear Sir:
We have enclosed responses to the subject RAIs which you forwarded in Ref erence (b).
Please assure that these responses are reflected in the Draft Safety Evaluation Report which is to be published in the near future.
Very truly yours, YANKEE ATOMIC ELECTRIC COMPANY n,,
og Of ESs, Ay UL, 0 J. DeVincentis C
jof
- Project Manager Enclosures 8207280092 3
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271.1 The FSAR should clearly define loads and how they are being combined. The loads should be defined such that they can be distinguished from one another as to their causes, for example, normal operation, loss-of-coolant accident, high energy line break, etc.
In Table 3.9(B)-2, both the load definition and the load combination should be clarified.
RESPONSE
Table 3.9(B)-2 pertains to ASME Code Class 1, 2 and 3, " Mechanical Components", only. Load combinations for piping systems are provided in Table 3.9(B)-7.
Loads are combined such that they correspond to the different plant conditions. For example, internal pressure, P, varies and the appropriate pressure is used for the design, normal operation and faulted condition (i.e., Pd, Po, etc.).
Design transients are further discussed in Subsection 3.9(B).l.l.
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27i.2 For operability qualification, thermal loads should be considered as a primary load and both the inertia and relative displacement load from earthquake and other dynamic loads should be accounted for.
RESPONSE
As defined in the load combination tables, thermal and seismic loads, as well as other dynamic loads, are combined for the appropriate plant condition.- In the evaluation of these loads, displacements are also taken into account. Refer to Table 3.2(B)-2, which will be revised in Amendment 46.
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TABLE 3.9(B)-2 DESIGN LOADING COMBINATIONS FOR ASME CODE CLASS 1, 2 AND 3 COMPONENTS AND SUPPORTS (Other Than Piping Systems)
Plant Loading Conditions Design Loading Combinations No rmal P+D+L+M+NOL+T Upset P + D + L + M + NOL + OBE + H + Ft+T Emergency P + D + L + M + NEL + H + F t Faulted P + D + L + M + NFL + SSE + H + Ft Where:
Pressure corresponding to the loading condition P
=
Dead weight D
=
L Live weight of fluid handled; for liquid content of vessel or tank
=
Snow or wind load for outdoor storage tank M
=
Nozzle load for Normal / Upset condition NOL
=
Nozzle load for Emergency condition NEL
=
Nozzle load for Faulted condition NFL
=
Operating Basis Earthquake (inertia load)
=
Safe Shutdown Earthquake (inertia load)
=
Dynamic fluid head effects (where applicable)
H
=
Valve thrust loads (where applicable)
F
=
t Thermal load (where applicable)
T
=
271.'3 Clearly define the stress limits for non-ASKE components and address interaction effect of stress components in a complex stress field, for example, between tension and shear.
RESPONSE
BOP The AISC stress limits are used for non-ASME components. Refer to the response to RAI 210.39 for detailed discussion.
NSSS Non-ASHE Code parts of active pumps and valves are separated into two categories: Class 1E electrical appurtenances (e.g., valve operators, pump motors) and non pressure boundary parts (e.g.,
valve stems, pump shafts, etc.).
For Class lE appurtenances, seismic qualification and operability are generally demonstrated by testing.
If analysis is used, the discussion provided below for non pressure boundary parts is applicable. A further discussion of the seismic qualification methods for Class lE appurtenances is provided in Section 3.10.
For critical non pressure boundary parts, Westinghouse identifies general criteria in specifications. These criteria are consistent with ASME Code criteria or limit allowable stresses to less than material yield strength. The equipment manufacturer is responsible for selecting appropriate materials based on the guidelines provided in Westinghouse specifications. Westinghouse reviews the acceptability of these materials selected by the equipment manufacturer.
For critical non-ASME Code pressure boundary parts, stresses are analytically conbined consistent with the requirements of the ASHE Code, AISC Manual, Machinery Handbook, or other industry accepted practices.
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1 271.4 Do you intend to commit to the most recent IEEE Standards, that is, IEEE-323-1974 and IEEE-344-1975 and Regulatory Guides 1.89 and 1.100 for both BOP and NSSS equipment? The commitment should be reflected in the FSAR or the justification for not committing.
RESPONSE
Refer to FSAR Section 1.8 for a thorough discussion regarding commitment to these standards and regulatory guides.
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271.'5 Please provide submittal dates for the following documentation:
1.
Report number of the Westinghouse Seismic Qualification Report on the motors for the emergency feedwater pumps.
2.
The motor analysis for the diesel fuel oil transfer pump.
RESPONSE
1.
The Westinghouse Report number is #75F3233 for the Emergency Feed Water Pump Motors.
2.
The motor analysis report for the diesel fuel oil transfer pump will be sent to the NRC by November 1982.
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271.6 What active pumps and active valves remain to be qualified by test and/or analysis as referenced in FSAR Section 3.9(B).3.27
RESPONSE
The seismic qualification status of all safety-related components, including the active pumps and valves, is summarized in our document entitled "Public Service Company of New llampshire, i
Seabrook Station - Units 1 & 2 Seismic Qualification Review Team (SQRT) Equipment List", which was forwarded to Chief Licensing Branch #3, Division of Licensing, under cover of PSNH's letter, i
dated May 27, 1982.
Refer to Amendment 45, Page 3.9(B)-21.
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271.'7 Regarding pump and valve operability assurance, was the entire assembly (pump and motor or valve and driver) analyzed and/or tested as a unit or separately. If separately, did the analysis include the loads imposed from each component on one another.
RESPONSE
BOP Pump / motor and valve / driver assemblies were analyzed as single units in the operability assurance evaluation.
NSSS Pumps Separate analyses are performed on the pumps and motor.
Each of these analyses takes into account the interface loading reqairements that apply to that component. An integrated operational analysis is then performed on the combined pump and motor assembly which insures operability during and after a SSE.
This analysis takes into account all interface loads of the total assembly. Further details on these analyses are contained in Section 3.9(N).3.2 of the FSAR.
Valves Valve operability is demonstrated by a combination of the following methods:
a.
Electric appurtenances for active valves are qualified by tests (in accordance with IEEE-323-1974 and 344-1975) that take into account interface loading requirements.
b.
Active valve bodies are seismically analyzed using methods that consider interface loading requirements.
c.
Valve deflection tests as described in Section 3.9(N).3.2 are also conducted that take into account all interface loads.
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271.8 In order to assure operability through the qualified life of the equipment, it is necessary first to age the equipment to a condition which stimulates its expected end-of-life condition including the effect of radiation, and second, to qualify for the accident environment. Discuss your qualification program in sufficient detail addressFag the qualification sequence indicated a bove.
RESPONSE
BOP Our qualification review procedure for evaluating vendor _ submitted qualification reports requires that all qualification programs follow the test sequence outlined in IEEE-323-1974 for type testing. The test sequence followed is essentially inspection, performance under normal and extreme conditions, thermal and radiation aging, mechanical vibration, seismic' simulation and concluding with operation while exposed to a simulated design basis event. Any deviation from this procedure is evaluated on a case-by-case basis, with full justification required for use of other methods such as anslysis, operating experience or a combination thereof.
All test parameters employed by the vendors for performing the qualification tests on their respective equipment are required to be, as a minimum, the Seabrook specific design values shown in the service environmental chart, Figure 3.11-1, or are test levels which envelope the Seabrook design levels.
NSSS Pumps The Westinghouse pumps and valve operability program for active pump and motor assemblies is divided into several sections.
Based on a review of the design of the pump / motor assembly, the only thermal or radiation susceptible components are the motor insulation system, lubricants, and seals composed of organic materials. The lubricants and organic seals are periodically replaced during plant maintenance and surveillance procedures and, as a result, are maintained in an "as new" condition. The motor insulation system is subjected to thermal, radiation, and vibration aging in accordance with the guidelines set forh' in IEEE S tandard s 323-1974 and 344-1975.
Af ter completion of the aging portion of this test, the motor stator is then subjected to seismic qualification te'sts.
Specific details and results of this program are outlined in the appropriate references listed in the FSAR.
Completion of these tests and the required maintenance procedures, coupled with the analyses discussed in Section 3.9(N).3.2, provides assurance that these assemblies will perform adequately when subjected to SSE loading at the end-of-life condition.
Valves A similar procedure for valve qualification is followed. Active valve electric appurtenances are qualified in accordance with IEEE-323-1974 and 344-1975. Other potentially age-sensitive components within the valve body are maintained by plant maintenance and surveillance procedures.
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271.9 It is indicated that electric equipment that do not undergo a change of state are qualified for seismic resistance by analysis.
Batteries have heavy mass and the terminals connecting the batteries generally develop an interface for change in rigidity.
Thus, the batteries may need to be qualified by tests with supporting analysis. Also, certain cooling accessories to transformers may need to be qualified by a combination of test and analysis. Modify the FSAR to clearly indicate the procedure you are following.
RESPONSE
BOP Seismic qualification tests are conducted for battery prototypes with cables (or equivalent batteries with cables) in accordance with the requirements of IEEE-323-1974 and IEEE-344-1975. The battery racks are qualified by appropriate seismic analyses which include the battery masses. The Class lE transformers are seismically qualified by test using an appropriate test apparatus which includes the supporting structures or cabinets and all relevant appurtenances including cooling accessories. This effort is included in the Class lE Unit Substation Qualification as noted in Table 3.10(B)-1.
NSSS As described in Section 3.10 Westinghouse seismically qualifies all NSSS supplied electrical equipment by test or combination test and analysis.
Based on this, no additional FSAR modifications are required.
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271.10 Certain electric equipment may be subject to the effect of impulsive pressure pulses or other dynamic loads. This equipment may be close to a high energy line. Describe in the FSAR what other dynamic loads will be used in the qualification of electric equipment, and how the dynamic loads will be combined with the seismic loads when (1) the qualification is performed by analysis, (2) the qualification is done by tests.
RESPONSE
BOP Essential electrical equipment is protected from external. loads such as jet impingement, pipe whip, etc.
As a result, such potential transient loadings are not employed for qualification of electric equipment.
NSSS 4
For Westinghouse supplied NSSS Class IE equipment, seismic loads are, in general, the only loads that could affect this equipment.
For example, Class IE equipment is protected from such external loads as pipe whip, jet impingement, etc., as described in the FSAR.
The only instrumentation subject to dynamic loads are line mounted Reactor Coolant System RTD's.
Dynamic loads resulting from a LOCA are considered in the development of the seismic test envelopes for this equipment. Flow induced vibrational loads are also accounted for in the qualification of this equipment.
i 271.11 Indicate in the FSAR how the seismic qualification will be I
performed in sequence with environmental qualification test as required under IEEE-323-1974.
RESPONSE
BOP Seismic qualification will be performed in the sequence outlined in IEEE-323-1974. The sequence is basically inspection, J
performance under normal and extreme conditions, thermal and radiation aging, mechanical vibration, seismic simulation and I
operation while exposed to a simulated design basis event.
Any deviation would be evaluated on a case-by-case basis with comprehensive justification if analysis is employed.
l NSSS Seismic qualification for Westinghouse supplied NSSS Class IE equipment is performed in accordance with the guidelines specified i
in IEEE-323-1974 and 344-1975. This test program includes the use of the sequence recommended in IEEE-323-1974.
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