ML20023D356
| ML20023D356 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 05/17/1983 |
| From: | Spessard R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Vandewalle D CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| References | |
| NUDOCS 8305200407 | |
| Download: ML20023D356 (2) | |
Text
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MAY 171933 Docket No. 50-255 Consumers Power Company ATTN: Mr. D. J. VandeWalle Nuclear Licensing
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Administrator 212 West Michigan Avenue Jackson, Michigan 49201 Gentla=*n :
Th==k you for your letter dated April 28, 1983, providing updated infor-mation relative to Licensee Event Report 83-06, includi>g your proposed schedule for modifications to the Safety Injection Refueling Water (SIRW) tank support structure to bring the support structure into accordance tith the FSAR and ACI Code.
In response to LER 83-06 dated February 17, 1983 a member of the NRC Region III staff and the NBC Resident Inspector conducted an independent inspection of the SIEW tank support structure (Reference Inspection Report No. 50-255/83-08). Additionally, the NBC Region III staff mesber met with personnel from Consumers Power Company and Bechtel to review their analysis of the support structure.
Based upon the updated information, the results of the inspection, review of your analysis of the existing support structure, your commitment to conduct quarterly inspections until the structure is modified, and consid-ering the extent and number of activities already scheduled for the 1983 i
outage, Region III concurs with your plan to do the remedial work during 1
the 1985 refueling outage.
We request that Consumers Power Company apprise Region III of the results of the quarterly inspection through the NRC Resident Inspector. It is also requested that the Region III staff participate in the initial quar-terly inspection and a minimum of one additional inspection. Also, that the NRC Resident Inspect.or participate in any or all of the anticipated inspections.
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DATE) l NRC FORM 318 (10-80) NRCM O240 OFFICIAL RECORD COPY
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d' Consumers Power Company MAy 171933 The Region III staff will be in contact with Consumers Power Company cognisant personnel to determine the availability for review of the necessary procedures, work packages, and method of repair for the mod-ifications to the SIN tank support structure.
We will gladly discuss any questions you may have regarding this matter.
Sincerely, W
.R. L. Spessard, Director Division of Engineering ces R. W. Montross, Manager cc w/1tr dtd 4/28/83:
DNB/ Document Control Desk (RIDS)
Resident Inspector, R III Ronald Callen, Michigan Public Service Commission f
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. us 4 eses. mm vos osso April 28, 1983 J:mes C Kappler, Administrator Rgion III US Ihnelear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137 l
DOCKET S0-255 - LICENSE DPR FALISADES PLANT - LICENSEE EVENT REPORT 83-06 ($1RW TANK SUPPORT STUCTURE DISCREPANCIES) UPDATE Consumera Power Company reported a discrepancy between the actual configura-tion and the as-built design documents for the Safety Injection Refueling Water (SIRW) tank support structure in licensee event report 83-06 dated Fcbruary 17, 1983.
Specifically, thirteen three-foot aguare openings and one 26 inch by 38 inch opening are present in the concrete beams as compared to tho eine openings identified on the as-built documentation.
Our evaluation has concluded that although the existing condition is not in accordance with the PSAR and AC1 Code. sufficient capacity to resist specified loadings la esistained.
Consumers Power Company also committed to provide specifie information relative to the design and schedule for proposed modifications to bring the support structure into compliance with the Palisades Plant FSAR and ACI Codc.
The purpose of this Ictter is to provide Consumers Power Cor-pany's cchedule for modifications.
Design details will be available for inspection cbout June, 1983.
Please_1.dentify_your.. documentation _needs_so_ that_ a design -
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- '1ew pacpage can be prepared and forwarded to you when it_becomes available.
he currently selected optimum design fix would involve relieving the stress in the SIRW tank support beams by draining most of the water from the SIRW teak and filling the eight openings in the north-soeth beams of the support ctructure with concrete and steel reinforcement bars to provide adequate shear ecp: city in the SIRW tank support beams.
Steel reinforcing bars would be dowaled into the beam webs to transfer the shear force from the existing web to the repair.
Conduit and piping presently routed through the foundation would be rerouted for accessibility. Engineering design efforts. are presently ongsing and currently scheduled to be complete about June 1983.
Subsequent offerts includes review of the design by Consumers Power Company, the develop-l meat of construction work packages, the performance of pre-outage work such as the procurement of meterials, the fabrication and installation of piping and l
cuppsrts on the building roof, preparation of electrical conduit end wiring fer dismantling and rearranging and the commencement of core drilling in SIRW tcnk support beams to accommodate the aforementioned dowel pins.
Dese prsporatory activities are estimated to take about 12 weeks to complete.
Actus!
OC0483-0012A-NLO2
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2 JCKcpplor. Ad inictrctor Palisades Plant LER 83-06 UPDATE April 28, 1983 cutcge work is estimated to take 10 weeks to complete with concrete curing controlling much of the critical path because the SIRW tank must be empty during that time.
Currently we have accelerated the start date of the 1983 Palisades refueling ouatage from October 15, 1983 to August 13, 1983.
This is due to the excellent plant availability that Palisades has demonstrated in the past eight months (> 97%) and our extensive outage planning effort which has scheduled all outage work for the contigency of an early start by as much as 63 to 90 d;yo.
This refueling outage includes several projects and programs critical to the continued safe operation of Palisades such as the 10-year Inservice Inspection including the mechanized reactor vessel exams and core barrel removal and ansaciated exams, installation of a third auxiliary feedwater pump, completion of the control room habitability modifications and upgrades, remedying the locking safety injection bottle check valves, completing the Systematic Evolustion Program modifications as previously committed in the Integrated Accosoment, and performing other significant activities including the sipping of a majority of the nuclear fuel, steam generator inspections, major turbine modifica-inspections and main electrical generator availability improvement tions. Although complete manpower loadings for all work are not now ovoilable, it is estimated that there will be 1100 to 1400 personnel working on cita during peak periods of the outage.
To allow for more detailed planning of the actual implementation of the preposed SIRW tank support structure design, to provide sufficient lead time fcr all materials, and to accommodate evaluating alternative engineering fixas, the merits of planning this fix for the 1985 Palisades refueling outage are extremely attractive.
In light of these considerations and based upon our detailed analyses which indicate that the existing structure does not adversely affect the health and cafety of the public Consumers Power Company is proceeding with planning the SIRW tank structural design fix as an integral part of the 1985 refueling In the interim, Consumers Power Company intends to conduct quarterly curage.
inspections of the structure by a t(am of structural engineers.
The purpose of this inspection will be to identify significant changes in structure that may have a potential for adversely affecting structural adequacy.
D:vid J VandeWalle (Signed)
D2vid J Vandekalle Nuclear Licensing Administrator CC Director, Office of Nuclear Reactor Regulation Director Office of Inspection and Enforcement NRC Resident Zuspector - palisades i
DC0483-0012A-NLO2
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