IR 05000341/1981019
| ML20040B573 | |
| Person / Time | |
|---|---|
| Site: | Fermi  |
| Issue date: | 01/12/1982 |
| From: | Danielson D, Erb C NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | |
| Shared Package | |
| ML20040B569 | List: |
| References | |
| 50-341-81-19, NUDOCS 8201260204 | |
| Download: ML20040B573 (4) | |
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U.S. NUCLEAR REGULATORY COMMISSION
REGION III
Report No. 50-341/81-19 Docket No. 50-341 License No. CPPR-87 Licensee: Detroit Edison Company 2000 Second Avenue Detroit, MI 48224 Facility Name: Enrico Fermi Nuclear Power Plant, Unit 2 Inspection At: Enrico Fermi 2 Site, Monroe, MI Inspection Conducted: December 8-11, 1981 Inspector:[d.H,bt
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M. Erb
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Approved 13y:
D.11. Danielson, Chief
/ // b Materials and Processes Section
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Inspection Summary Inspection on December 8-11, 1981 (Repert No. 50-341/81-19)
Areas Inspected: 50.55(e) item closcout regarding cracking of welds between ring girders and skin of the torus; review of 50.55(e) item regarding corrective action in CRD inseat and withdraw line penetrations through dry well wall; and observation of work to reinforce the torus inside and out.
The inspection involved a total of 22 inspector-hours onsite by one NRC inspector.
Results: No items of noncompliance or deviation were identified.
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DETAILS
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Persons Contacted Detroit Edison Company (DECO)
- ll. A. Walker, Supervisor Construction QA
- D.
Spiers, Director Field Engineering
i Other Personnel E. E. Lighthall, Site flanager, Reactor Controls (RCI)
H. Ausmus, Superintendent, Walbridge Aldinger (WACO)
- R.
FicCraney, QV Supervisor, Daniel International (DIC)
W. tiesick, Q.C. Supervisor, Reactor Controls, Inc. (RCI)
J. Sisson, Assistant Q.A. Supervisor, Reactor Controls, Inc. (RCI)
- Paul Byron, Resident Inspector NRC
- Denotes those present at the exit meeting.
Licensee Action on Previously Identified Items (Closed) 50.55(e) Cracking of Fillet Welds in Torus Welding The torus modification program for the Fermi 2 project required that the 5/16" fillet welds between the ring girders and the skin of the torus be in-creased to 3/4" This was done and cracks were found in the toe of the completed weld nearest to the 5/8" thick skin. Welding consultants were called in and the cause for these defects was reported to be due to hydrogen embrittlement. A reviseo weld procedure was developed and a final status report to the NRC-RIII was issued on April 14, 1979 indi-cating that the corrective action had been successful.
A walkdown in-spection inside and outside the torus and a review of the QC documenta-tion were performed by the inspector, and had no adverse finding. This 50.55(e) No. 341/78-07 is closed. Two performance tests:
(1) by water
fill up, and (2) integrated leak test will be conducted by the licensee
representatives, j
(Open) 50.55(e) CRD Penetration Clearance This item refers to insufficient thermal differential allowance at the CRD insert and withdraw lines where they penetrate the drywell wall.
Corrective actions involved core drilling i
around the outside of one bank of 64 lines and removing the entire block of concrete including the 64 3" guard pipes casted into the concrete for j
the protectien of the 1" insert and withdraw lines.
Each insert and withdraw line is welded to a short sleeve of stainless pipe 1 1/2" diameter, which is then welded to the 1 1/2" thick carbon
steel plate forming the drywell liner. The corrective action did not involve removing these fillet welds and the MC portion of the penetration has not been affected. The plan presently calls for the insert and with-
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draw lines to penetrate a matrix of cast concrete T shapes which would provide shielding without touching the stainless tubes for the insertion length of about 5 1/2 feet.
Information relative to the corrective action for shielding in this area and questions relative to the possible advance thermal effects were forwarded to NRC-NRR for their evaluation.
Functional or Program Area Inspected 1.
Reinforcement of Suppression Pool (Torus Modification)
Observation of work outside the torus showed that all welds directly to the skin of the torus had been completed. The large hold down plates were attached to the floor by grouted in bolts.
The heavy plate gussets were welded to the skin of the torus.
Welds at ring beams No. 6, 7, 8 and 16 were examined by the inspector. These welds were made in accordance with Installation Procedure I.P. 10.9 and were Magnetic Particle tested by RCI based on Procedure TP-110, Revision 4 requirements.
Ultrasonic testing was performed by NES on 3/4" inside fillet welds based on Procedure TP-125 requirements.
If excavation required, PT was performed to establish soundness prior to welding repair. Original torus was constructed by CBI to ASME Section III 1971 Edition, Winter 1972 Addenda. Modification has been performed by RCI to ASME Section III 1977 Editioa, Summer 1977 Addenda.
No items of noncompliance or deviation were identified.
2.
Status of Internals and Fuel Racks The top fuel guide #B11D004 received on November 16, 1972 has had reinforcement added at outside corners by RCI as required by G.E.
It has been accepted and will be fitted into the vessel in the near future.
The original fuel racks are being removed and will be replaced by high density racks. The replacement racks will have poison (Borosil)
built into them.
No items of noncompliance or deviation were identified.
3.
Inspection of Welding Repairs Guard Weld No. IVW2 on penetration X-43 had three grindout areas that had not been repaired in June 1981. These grindouts were located underside of a 30" guard pipe and were not visible unless one erouched down and looked up.
During the previous inspection there was no tag indicating any problem with the weld and the licensee stated that the weld was got yet completed.
The weld and quality control documentation
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were checked during this inspection. This weld was in final repair during November of 1981 and an acceptable result was obtained.
No items of noncompliance or deviation were identified.
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Exit Interview The inspector met with licensee representatives (denoted under Persons Contacted) at the conclusion of the inspection on Ijecember 11, 1981.
The inspector summarized the purpose and findings of the inspection, which were acknowledged by the licensee.
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