IR 05000320/1979016
| ML19254E666 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 09/17/1979 |
| From: | Chaudhary S, Lester Tripp, Walton G NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | |
| Shared Package | |
| ML19254E663 | List: |
| References | |
| 50-320-79-16, NUDOCS 7911020140 | |
| Download: ML19254E666 (4) | |
Text
{{#Wiki_filter:. . U.S. NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT Region I Report No.
79-16 Docket No.
50-320 License No. DPR-73 Priority -- Category C Licensee: Metropolitan Edison Company P.O. Box 542 Reading, Pennsylvania 19603 Facility Name: Three Mile Island Unit 2 Inspection at: Middletown, Pennsylvania Inspection conducted: June 1-12, 1979 Inspectors: M @ //[g Cf f t; - 79 - G. Walton, Reactor Inspector date signed b. lf.
niu^ nk/ Cl-t 0- 79 S. Chaudhary, Reactor Ir/pector date signed . date signed Approved by: . [. h@ '[[D[79 L.UTripp, Chidf, Engineering Support Section date sigr.ed No. 1, RC&ES Branch Inspection Summary: Inspection on June 1-12, 1979 (Report No. 50-320/79-16) Areas Inspected: Special, announced inspection by regional based inspectors of modifications being made on several systems to provide long term cooling of the reactor core. The function of this inspection was for surveillance of the licensee and contractors activities of the modifications which are being made under " emergency conditions." The inspection involved 63 inspector-hours onsite by two NRC regional based inspectors.
Results: No items of noncompliance or deviations were issued. The attached re-port details the surveillance activities.
I24!3 29l Region I Form 12 (Rev. April 77) 7 911020 / V6
. . DETAILS 1.
Persons Contacted This report is a continuation of surveillance activities conducted by the Reactor Construction and Engineering Support Branch of Region I at Three Mile Island, Unit 2.
See Inspection Report 50-320/79-09 for listing of persons contacted.
2.
System Modifications As a result of the inc; dent on March 28, 1979 at Three Mile Is!and, Unit 2, the licensee has initiated several system modifications to the existing plant.
This report covers the surveillance activities of the Reactor Construction and Engineering Support Branch of Region I during the month of June, 1979.
A description of the modifications and applicable codes are described in I&E Inspection Report No. 50-320/79-09.
This report covers the inspectors surveillance of some of these modifications.
Surveillance of DHR System Penetration Installation in Auxiliary Building TS-15 The core boring method for penetrating the auxiliary building . wall was decided in preference to "0xygen Lancing" due to inspector - concerns regarding effects of "0 Lancing" on the surrounding
structures.
The licenseeinitiatud a series of practice and qualification test for core boring process and grouting of installed penetrations on concrete blocks.
Core boring was determined to be relatively easy and an expeditious operation.
However, the grouting of wall after sleeve installation was more difficult and lengthy process.
Several differing arrangements of grout injection were tried to determine an acceptable configuration of grout injection system which would assure a solid, void free bond between the penetra-tion sleeve and the surrounding wall.
Two different materials were tried as a filler: a.
High strength-high density epoxy resin, and b.
Premixed, packaged non-shrink (expansive) portland cement grout.
(Master Builders "Masterflow-713"). 1248 292
. .
After several runs with both materials and different injection arrangement,non-shrink grout was selected for installation.due to its ease of injection, reproducibility of results and previous service history in similar application in power plants.
After the process and crew qualifications, it was determined that the original location selected for penetration in the Auxiliary Building wall from outside would encounter some interference with electrical conduits inside the building.
Therefore, a new location for penetration was selected several feet away from the original location.
The inspector witnessed the core boring operation in the auxiliary building wall.
A total of twelve penetra, ions were made.
Three of the penetrations were of 10" and 12" diameter size and the rest 3" to 3 1/2" in diameter.
Except for some scheduled delays due to equipment availability and some due to other adminis-trative reasons, the c're boring was completed in several days as planned and prccedurally approved.
Penetration sleeves with associated grouting system were installed in these borings.
The grouting of the insialled system began on June 15, 1979 after several delays, and was completed in one continuous operation.
Inspector witnessed the grouting operation and found that all operations were car"ied out as approved by the procedure and there was no covious noncompliance.
GPU QA/QC was at the site of operations for verification and testing of materials and equip-ment.
Reviewed radiographs of welds TS-15 Weld 20, TS-15 Weld 13, TS-15 . Weld 23, TS-15 Weld 21.
This review was made to ascertain compli-ance with the applicable code and procedure.
The review included density, penetrameter placement and location.
Reviewed Procedure SP 4200-109 Rev. 1, Qualification of Welding . Procedure Specifications.
This specification is intended to interpret, define, and outline qualification of welding procedure specifications.
Reviewed Procedure SP-4200-102, Revision 7, Qualification of . Welders.
In addition to the above, the inspector performed daily surveil-lance of this activity and talked to craftsmen and GPU QA inspectors.
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s .
3.
Exit Interview During this inspection, the inspector met daily with the GPU Quality Assurance Manager and discussed the important aspects of the ongoing modifications.
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