ML20206G358
| ML20206G358 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 11/04/1988 |
| From: | NRC OFFICE OF SPECIAL PROJECTS |
| To: | |
| Shared Package | |
| ML20206G037 | List:
|
| References | |
| NUDOCS 8811220248 | |
| Download: ML20206G358 (2) | |
Text
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SAFETY EVALUATION REPORT BY THE OFFICE OF SPECIAL PROJECTS ELEMENT REPORT CO 11302-50N "DESIGN OF ANCHORS AS REL ATED TO CONSTRUCTION TENNESSEE VALLEY Ao7HORITY l
SEQUOYAH NUCLEAR POWER PLANT UNITS 1 AND 2 DOCKET NOS. 50-327 AND 50-328 t
1.
Subject i
s Categcry: Construction (10000)
Subcategory:
Anchorages (11300)
Element:
Design of Anchors as Related to Construction (11302)
Concerns:
PH-85-002-09, IN-86-200-003 The bases fc-Element Report CO 11302-SQN, Rev. 1. dated October 10, 1985 are the following Watts Bar employee concerns which question the use of redhead type concrete anchors at TVA nuclear sites PH 85 002-09 i
C/l is concerned about the usage of Phillips Red Head anchor bolts for attaching items to concrete, due to redheads having been declared unsuit-able for use and replaced at a number of other non-TVA nuclear sites.
I Const. Dept. Concern C/1 has no further infomation.
I IN-86-200-003 j
I The use of "Red Heads" for support is not safe in that the concrete could be honeycombed around the "Red Head".
Const. Dept. Concern C/I has no additional infomation.
No follow-up required.
These concerns were evaluated by TVA as potentially nuclear safety-re-l lated and potentially applicable to Sequoyah (generic).
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Surrary of issue The Employee Concerns Task Group (ECTG) report identified the following issue from the employee concerns:
The use of redhead type concrete anchors is unsuitable at TVA nuclear a.
sites.
III. Evaluation Elerent Report CO 11302-SON, Revision 1 referenced three separate independent reviews that were performed on the suitability of redhead type anchors. These reports included NSRS Investigative Report :-85-440-WEN, the Sequoyah Nuclear Plant (SON) Generic Concerns Task Force (GCTF) report and the Watts Bar Employee Concerns Element Report (C011302).
These reports referenced TVA General Construction Specifi1ation G-32 inspection and test criteria as providing evidence of th? suitability of redhead anchor installations, in addition, the SQF-GCTF report referenced the results of sample inspections perforud in response to NRC IE Bulletin 79 02 as providing additional evidence of the adequacy of redhead anchor installations at Sequoyah. Based on the results of these reviews the ECTG report concluded that the stated concerns were not The staff concurs viu, the conclusion that redhead anchor bolts valid.
are suitable for use at nuclear power plants provided they are properly installed and qualified.
Additional employee concerns related to the design and installation of concrete anchor bolts at Sequoyah have been aodressed in the staff's safety evaluations of Element Reports CO 11301, CO 11305 and CO 11306.
These reports found several of the specific employee concerns with tha installation and testing of anchors at Squoyah were valid. TVA accressed the specific installation and testing concerns by testing and inspecting a sample of anchors and evaluating the results to demonstrate TVA also comitted to revise the adequacy of the installed anchors.
The drawing details and procedures to address some of the concerr.s.
staff found that the employee concerns related to the design and installation of concrete expansion anchors had been adequately addressed i
I for Sequoyah restart.
IV.
Conclusions Based on the review of Employee Concerns Element Report CO 11302 50N, Revision 1 the staff concludes that Employee Concerns PH-85-002-09 and IN-86 200-003 have been adequately addressed at Sequoyah. The staff considers redhead type anchor bolts acceptable for use at Sequoyah provided they are properly installed and qualified. The staff review of employee concerns related to anchor bolt design and installation are contained in staff safety evaluations of Employee Concerns Element Reports CO 11301, CO 11305 and CO 11306.
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