ML18046A255
| ML18046A255 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 12/23/1980 |
| From: | Frost S CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | Crutchfield D Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8012290243 | |
| Download: ML18046A255 (2) | |
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consumers Power company Generel Offices: 212 West Michigan Avenue, Jeckaon, Michigan 49201 * (617) 788-0650 December 23, 1980 Director, Nuclear Reactor Regulation Att Mr Dennis M Crutchfield, Chief Operating Reactors Branch No 5 U S Nuclear Regulatory Commission Washington, DC 20555 DOCKET 50-255 - LICENSE DPR PALISADES PLANT - RESPONSE TO CONCRETE CONTAINMENT STRUCTURES NRC letter dated November 25, 1980 requested Consumers Power Company, on a voluntary basis,. to supply information for an Inservice Inspection Program for Prestressed Concrete Containment Structures.
Attached is.the requested information for the Palisades Plant Containment Tendon Surveillance Program.
Steven R Frost Palisades Licensing Engineer CC JGKeppler, USNRC NRC Resident Inspector-Palisades Attachment
ATTACHMENT Su.PJect:
In::;ervic~ In1:>pection Program for Prestressed Concrete.
Containment Structures.
Reference (1):
Letter CP Co (Bixel) to NRC (Purple) dated 3/26/76; Subject, Palisades Plant Containment Building Tendon Surveillance Report.
(a)
Sample size and method of sample selection.
Answer - Reference Paragraph 4.5.4 of Palisades Technical Specifications and Test Procedure TSF-2 contained in Reference (1) above.
As pointed out in the Technical Specifications, CP Co uses a random basis for selecting dome, vertical and hoop tendons, but modifies this selection process to omit tendons that are contoured to fit the existing penetration configurations and omit tendons that would require test crews to work close to* safety-related systems such as the spent fuel pool.
(b)
Procedure for lift-off testing Answer - Reference Test Procedure TSF-2 contained in Reference (1) above.
(c)
Procedure for testing of corrosion inhibiter.
(ie, grease)
Answer - As in (b) above.
(d)
Procedure for tendon material testing.
Answer -
A1:> ln (b) above.
(e)
Acceptance and rejection criteria used for the test programs.
Answer - Reference Paragraph 4.5.4 of Palisades Technical Specifications and Test Procedure TSF-2 contained in Reference (1) above.
(f) Repair, replacement and corrective action.
Answer - To date, we have experienced no sufficient degradation to cause repair or replacement of the tendons.
We have however, experienced some discrepancies such as off-size and split buttonheads, discontinuous and broken wires, etc. during our surveillance program in 1975.
The correc-tive actions/resolutions that were made concerning the discrepancies were reported to the NRC in Reference (1).
Although test procedures are not yet finalized for Palisades 1981 Tendon Sur~
veilla.nce Program, *it is anticipated that a portion of the old Test Procedure
. --TsF.:2.will beup-graded--to-meet curren't-tes~ing-cri--e-erni::-.--Tll.~se--finalized-pro------* -.--*----
cedures will be ava~lable just prior to the start of the 1981 Tendon Surveil;_
lance Program now scheduled to start in May 1981.