ML20054E045
| ML20054E045 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 03/23/1982 |
| From: | Scherrer J FRANKLIN INSTITUTE |
| To: | Staley G NRC COMMISSION (OCM) |
| Shared Package | |
| ML20054E043 | List: |
| References | |
| CON-NRC-03-79-118, CON-NRC-3-79-118, TASK-03-03.C, TASK-3-3.C, TASK-RR NUDOCS 8204260061 | |
| Download: ML20054E045 (5) | |
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(DRAFT)
REQUEST FOR ADDITIONAL INFORMATION HYDROLOGICAL CONSIDERATIONS INSERVICE INSPECTION OF WATER CONTROL STRUCTURES i
YANKEE ATOMIC ELECTRIC COMPANY l
YANKEE R0WE NUCLEAR POWER STATION NRC DOCKET NO.50-029 FRC PROJECT C5257 NRC TAC NO. 41549 FRC ASSIGNMENT 16 NRC CONTRACT NO. NRC-03 79-118 FRC TASK 544
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Preparedby Franklin Research Center Author: J. S. Scherrer 20th and Race Street Philadelphia, PA 19103 FRC Group Leader:
J. S. Scherrer Preparedfor Nuclear Regulatory Commission Washington, D.C. 20555 Lead NRC Engineer: G. Staley March 23, 1982 m
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. Franklin Research Center A Division of The Franklin Institute
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BACKGROUND is the result of an This Request for Additional Information (RAI) evaluation of. the Licensee's submittal, received February 3,1982, for the systematic evaluation program (SEP) Topic III-3.C, " Inservice Inspection of The Water Control Structures," for the Yankee Nuclear Power Station.
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purpose of this EEP topic is to assess the confo'rmance of the prese'nt
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inspection program for water control structures to Regulatory Guide 1.127 (Inspection of Water Control Structures Associated with Nuclear Power This includes evaluation of pertinent elements of the Licensee's Plants).
program against current criteria and the safety significance of any deviations.
The Licensee's submittal is, deficient in several areas, and should be extensively suppl'emented to conform more fully to the model SEP' Topic III-3.C, Inservice Inspection of Water Control Structures for San Onofre, Nuclear Inaccquacies in'the Licensee's Generating Station Unit 1, prepared by the N3C.
submitt'al raised concerns which are addressed in this RAI.
The information obtained by this RAI will supplement other docketed information concerning inservice inspection of water control structures and will be used to resolve all outstanding issues under this'SEP topic.
ITEM 1 a
CONCERN Regulatory Guide 1.127 describes a basis acceptable to the NRC staff for developing an appropriate inservice inspection program for dams, slopes, canals, and other water-control structures associated with emergency cooling The Licensee's water systems or flood protection of nuclear power plants.
submittal describes, on page 1 in the second paragraph of Section 4.0, Discussion, a formal inspection program for the Yankee site which the Section 5.0, Licensee states would comply with Regulatory Guide 1.127.
Technical Evaluation, page 2 of the Licensee's submittal states, " Yankee concludes that the in-service inspection programs for water control structureC at Yankee are acceptable and 'me'et the intent of Regulatory Guide 1.127."
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o is unclear whether this conclusion refers to the existing or the ideal inspection program.
REQUEST State whether the formal inspection program described on page 1 in the second paragraph of Section 4.0 of the Licensee's submittal is now in effect for the Yankee site or will be in future. -
ITEM 2 CONCERN Regulatory Guide 1.127 applies to water control structures whose failure could cause. radiological consequences adversely affecting the public health and safety. Harriman Dam fulfills this requirement but was not identified by the Licensee in its submittal.
Regulatory Guide 1.127 states, "The NRC staff may consider the recommendations of' this guide fulfilled by the applicant or licensee if the structure is regulaced by another agency or State that enforces a comparable inspection program." The Licensee's submittal must include evidence that the inspection programs at Sherman and Harriman Dams are comparable to that required by the NRC or should provide justification for any l'
deviations.
REQUEST Tb demonstrate that both Sherman and Harriman Dams are subject to inspection programs comparable to that required for water control structures i
by Regulatory Guide 1.127, provide copies of the inspection ryports used for those dams. Specify the required frequency of inspection and.tle required l
qualifications for the inspector, and describe the data maintained onsite concerning the water control structures.
ITEM 3 l
CONCERN Regulatory Guide 1.127 suggests that the inspection of water control structures should be conducted under the direction of qualified engineers
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e experienced in the investigation, design, construction, and operation of such facilities.
No statement indicating' compliance with this principle was made in the Licensee's submittal.
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REQUEST Verify that inspections are performed by or under the direct supervision of competent engineering-personnel.
ITEM 4 CONCERN Regulatory Guide 1.127 suggests that a detailed checklist be developed and used for inspection of each water control structure, paying particular attention to detecting evidence of leakage, erosion, seepage, slope instability, undue settlement, displacement, tilting, cracking, deterioration, and improper functioning of drains and relief wells. Although the Licensee's submittal identified a few of the items to be inspected for each water control structure, the list was not comprehensive.
REQUEST Provide evidence, such as a_ copy of*the inspector's checklist review sheet, indicating' the items or features subjected to review or scrutiny during inspection of water control structures at the Yankee Nuclear Power Station. If a detailed checklist is not used, provide the mechanism used by the inspector to report the findings.
ITEK 5 CONCERN Regulator
- Guide 1.127 requires the use of photographs for comparison of Y
previous and prVsent conditions, and documentation of new or progressive problems as parj of the inspection program. Technical reports presenting the results of eacn[. inspection should be maintained at the plant site for reference i
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o The Licensee did not and should be available to regulatory authorities.
specify whether photographs, checklists, or technical reports of past inspections are available at the Yankee site.
REQUEST State whether photographs, previous inspection reports, and checklists
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are kept and are used for comparison purposes during inspection.
ITEM 6 CONCERN' Regulatory Guide 1.127 requires that' safety-related water control structures be inspected immediately after the occurrence of unusually large floods, significant earthquakes, hurricanes, tornadoes, intense local Such an inspection is called a special rainfalls, or other unusual events.
inspection.
REQUEST Indicate whether the inservice inspection program includes special inspections following unusual events which could impair the functioning of safety-related water control structures.
ITEM 7 CONCERN Regulatory Guide 1.127 requires the development of an inspection schedule.
The Licensee's submittal does not identify the frequency of inspection.
REQUEST Specify the frequency at which inspections have been performed in the past for water control structures at"Y,ankee,or, if irregular, give the dates.
Identify the frequency of future inspections.
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