ML20030D918
| ML20030D918 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 08/31/1981 |
| From: | NRC OFFICE OF THE EXECUTIVE DIRECTOR FOR OPERATIONS (EDO) |
| To: | |
| Shared Package | |
| ML20030D910 | List: |
| References | |
| REF-10CFR9.7 NUDOCS 8109170152 | |
| Download: ML20030D918 (25) | |
Text
e III.
Preernt Status 1.
Noble gas m6hitors are now on site at SCN. These are IEEE Class 1E, seis=ic Category I, and qualified to the environment.
A.
The i=struments were procured frc= General Ato:ie Cc=pany.
3.
The instruments are area type acnitors. Two conitors per chann,el haye been procured; the range of CDe monitor ove.rlaps
'the range of the second monitor by one decade.
- Together, they cover the range required by RG 1 97.
C.
Infer =ation pertinent to the interi: noble gas =onitors is given below:
Instrument Nos.
Location 1,2-RE c0-260/261 R3 (Shield bidg) vent 1,2-RE-90-262/263 RB (Shield bids) vent 0-3E-90-235/236 Aux. Eldg.
Vent
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1,2-RE-90-255/256 Condensate Vacuum Pu=p Vent 2.p Control board panels which will hou'se the readouts for the interi: noble gas monitors in' the main control roo= are due to be shipped on Septe=ber 18, 1981.
3 The noble ~ gas monitor's will be installed at the first outage of
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sufficient duration.
~4.
TVA has interim procedures for monitoring. noble gas, iodine and particulate ef'fluents which were reviewed and a; proved by NRC as docu=ented in Sequoyah SER Supplement 1.
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5.
TVA expects to 'be able to procure and provide for noble gas, iodine and, particulate monitoring in accordance with regulatory requirements before startup following the firs { refueling outage.
- 6. - We esti= ate six weeks cf nonoutage and two to tr.ree weeks of outage time required to install the noble gas conitors.
Some work =ay require a two unit outage.
IV.
Recc=mendations TVA reco== ends that the Sequoyah unit 2 full power operating licen'se be conditiened to require installation of qualified particulate and
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iodine effluent monitors before startup following the first refueling j
outage and installation of the isterim noble gas effluent monitors l
at the first outage of sufficient duration.
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8109170152 810908 l
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PDR 10CFR
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PT9.7 PDR
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1-r Ocr.tain=2nt Prassure Monitor Tne design for a wide "Fange, =inus 5 to plus 60 psis, containment pressure
=enitoring syste: qualified to the appropriate sections of RG 1.97 as listed in Appendix 3 of NUREG-0737 has been co=pleted for Sequoyah Nuclear Plant.
The equi;=ent consisting of trans=itters, power supplies, l
recorders, and indicators qualified to IEEE 323-1974 was put out on bid invitation; and the first bid invitation was opened on January 8,1981.
~ ~ Three bids were received. but ncne were responsive since they could offer only IEEE 323-1971 qualification. - The second bid invitation was opened en May 5, 1981.
Only one bid was received and it was for IEIE 323-1971 equipment.
The thirc bid invitation was opened en July 16, 1981 with only one bid and same results.
Subsequent discussions with several vendors indicate that IEEE 323-1974 qualified equip =ent will be available in the first half of 1982. We will go out for bid again in Septe=ber 1981.
In the interi=, TVA has installed redundant wide range containment pressure indication utilizing T'- x 323-1971 equip =ent.
Pressure is indicated in the
=ain control roo=.
Other than in areas of qualificati,ons and the inability to record, the system =eets the NRC requirements.
TVA reco= mends that the Sequoyah un't 2 full power operating license be'
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i conditioned to require i=sta11ation of an instrument that meets NRC requirements before startup following the first refueling outage.
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Centainment Evdrogen Menitor The present installation ' meets the NRC requirements except for qualification.
The syste= is presently qualified to meet IEEE 323-1971.
However, the cenitors are b'eing tested to upgrade the qualifications to
=eet a nore severe environment.
The equipment has passed the test once, but due to failure to properly verify the calibration of the equipment before.the test, the test was invalidated. The equipment was returned to the =anufacturer and refurbished to original condition and is scheduled to be retested.
The equipment was received at the test laboratory in the lattei part of August 1981 and testing is scheduled to be ce=pleted in January 1982.
No changes to the syste= are anticipated as a result of this testing.
TV., reco== ends that the Sequoyah unit 2 full power license be conditioned to, require a qualified hydrogen =enitor before startup fe,11owing the first refueling outage.
Centainment Water Level Menitoring The present installation =eets the NRC requirements.
No' condition en the Sequoyah unit 2 full power operating license is
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required.
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Cc.tainment E diation Monitors Thehighrus*incontkin=entradiationmonitorsarenowcasitefer installatien.
The associated control equipment is expected to be onsite in Septe=ber 1981.
2.nstallation of t.he =enitor will require four weeks in cold r?.atdown (not including time for shutdown
- and startup) te allow for work inside the =ain centrol roo= and contain=ent building.
TVA expects +4 be able to have the high range containment radiation =enitors installed at the next outage of. sufficient duration.
TVA recc== ends that the 3equoyah unit 2 full power cperating license be cent.itioned to require installation cf the =enitor at the next outaEe of tufficient duration.
Su --> rv Based en the above discussions, TVA requests deferral of the 1 plenentation dates for the instrumentation described in section 11.0.1 of NUREG-0737 until qualified co=penents become available.
As noter'., the noble gas
=enitors should meet NRC's requirements; however, the iodine and particulate monitors cannot be instal] td until at least the first refueling' outage.
Qualified =enitors for conta.usent pressure and hydrogen j
concentration should be available by' =id-1982.
The installed containment wate.- level monitor presently installed meets current NRC requirements.
The containment high radiation moniter should be installed at the next outase of sufficient duratien..
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