ML20008F961
| ML20008F961 | |
| Person / Time | |
|---|---|
| Site: | Allens Creek File:Houston Lighting and Power Company icon.png |
| Issue date: | 05/11/1981 |
| From: | Leung V H Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20008F949 | List: |
| References | |
| NUDOCS 8105120402 | |
| Download: ML20008F961 (5) | |
Text
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O O.
os/11/81 UNITED STATES OF AfiERICA NUCLEAR REGULATORY C0'4MISS10rt BEFORE THE ATOMIC SAFETY AND LICENSIflG BOARD In the Matter of
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HOUSTON LIGHTIflG A!10 POWER COMPAflY Docket flo. 50-466
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(Allens Creek fluclear Generating Station, Unit 1) flRC SUPPLEMENTAL TESTIM 0llY OF VIrlCEflT T. H. LEUNG REGARDIflG RECIRCULATION PUMP OVERSPEED
[Doherty Contention 6]
Q.
Please state your name and position with the 'RC.
A.
My name is Vincent T. H. Leung.
I an a systen engineer in the Auxiliary Systems Branch of the Division of Systeas Integration. A copy of my statement of professional qualifications is attached.
Q.
What is the purpose of this testinony?
A.
The purpose of my testimony is to respond to Doherty Contention 6 concerning whether missiles can be generated from recirculation pump overspeed. Specifically, the contention, as written states:
Applicant has committed itself to provide a decoupler to prevent destructive overspeed of the recirculation pump motor. However, a potential for pump impeller overspeed exists. The applicant states that impeller missiles will not penetrate the punp case and that ejection of impeller missiles through the open end of the broken pipe will be prevented by additional pipe supports and restraints.
Petitioner requests that an adequate basis be provided to assure that these measures will be effective.
8105120 4dA
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\\ Q.
Has this contention been asserted as a result of an NRC generic concern?
A.
It appears so. The recirculation pump overspeed concern was classified as a generic issue, B-68 Pump Overspeed During a LOCA. On January 30, 1979, a review of all generic issues was presented to the Commission (SECY 79-76-Generic Issue Priorities). This paper established-priorities for resolution of these issues within the limited manpower resources available at that time. B-68 was given a relatively low priority on the basis of the following considerations:
1) safety significance 2) environmental significance 3) licensing and/or resource effectiveness or efficiency 4) need 5) applicability to operating plants, OLs and cps Q.
As a result of this low priority for resolution, what is the current status of this issue?
A.
As a result of this prioritization, work on B-68 has been stopped, and review of topical reports dealing with this subject has not l
been completed (e.g., NED0-10677 and its supplement and GE report transmitted to the staff by letter dated May 1,1978). Therefore, at this time the Staff has not resolved this generic issue.
A reevaluation i
of the list of generic issues is being done to determine those that warrant further Staff effort, and to develop a plan to resolve the more l
important issues.
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. g Q.
With respect to the Allens Creek' application, what has been recognized and committed to insofar as the outstanding resolution of this issue?
A.
The Applicant in PSAR Section 5.5.1.4 recognizes the lack of resolution of this generic issue and has agreed to provide a design and analysis in conformance with Staff requirements to be established when generic issue B-63 is resolved.
Q.
Pending resolution of this issue, what is the Staff's conclusion regarding the safety implications of continuing operation of licensed plants?
A.
The Staff believes that the probability of missiles damaging safety related equipment from overspeed of both the motor and inpeller of the recirculation pump without a decoupler is acceptably low to permit continued operation and licensing of plants. ib plant has been licensed to date with a decoupler on the recirculation punp.
Q.
Since the Applicant's present design as indicated in the PSAR includes a decoupler on the recirculation puap (intended to decouple the pump motor from the impeller in the event of overspeed), should this design be changed during the construction permit review?
A.
flo. As indicated above, the results of the generic study on this issue are not yet available.
If the results are not available during the operating license stage of review, or if they are available and indicate that decouplers should not be used, Allens Creek would be required to change its design to delete the de ouplers. Since the General Electric Company provides recirculation pumps without decouplers, the Staff expects that there should be no difficulty in changing to a
.g i-I design without a decoupler. With the Applicant's commitment ~ to adont the generic resolution, we. conclude that' a sufficient basis exists for
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. issuance of a construction permit and that the issue of impeller missiles
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' posed by the contention should be resolved, if necessary, as part of' tN generic resolution.
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k PROFESSIONAL QUALIFICATIONS Vincent T. H. Leung I am a system engineer in the Auxiliary Systems Branch, Division of Systems Integration, Office of Nuclear Reactor Regulation, U. S. Nuclear Regulatory Commission.
I am responsible for the review and evaluation of the functional capability of the auxiliary systems employed at nuclear power plants.
I have served in this capacity since April 1972.
F rom 1969 to 1972, I was a senior system engineer at Westinghouse Electric Corporation. I was responsible for technical plan review of stean and power conversion system, pressure vessels, piping systems, heat exchanger, stress analysis and wrote many computer programs to solve heat transfer problems relating to nuclear power plants.
From 1963 to 1969, I was a senior mechanical engineer at Avondale Shipyard, Inc. in New Orleans.
I was responsible for floating vessels design, mccine propulsion plants, offshore drilling platform and equipment design, piping system design and stress analysis.
I also wrote many computer programs to perform heat balance evaluation for marine power plane, heat transfer and stress analysis problems relating to Marine Engineering.
I received a Bachelor of Mechanical Engineering degree in Mechanical Engineering from Royal Melbourne Institute of Technology, Australia in 1960 and a Master of Science degree in Mechanical Engineering from Tulane University in 1963.
I am a member of the American Society of dechanical Engineers.
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