ML19320A965
| ML19320A965 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 07/03/1980 |
| From: | Herbein J METROPOLITAN EDISON CO. |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| IEB-80-12, TLL-315, NUDOCS 8007080375 | |
| Download: ML19320A965 (3) | |
Text
I t
i Metropolitan Edison Company Post Office Box 480 g
Middletown, Pennsylvania 17057 717 944 4041 Writer's Detect Deal Numiser July 3, 1980 TLL 315 Office of Inspection and Enforcement Attn:
B. H. Crier, Director Henion ?
f 11 S. Nuclear Henulatory Commission 631 Park Avenuu i
King of Prussia, PA 19406 6
Ik ar Sir:
Three Mile Island Nucicar Station, Unit I (TMI-1)
Operating License No. DPR-50 Docket No. 50-289 IE Bulletin 80-12 I
We have reviewed the events which occurred at Davis-Besse, and have reviewed the hardware capability of TMI-I to prevent a Decay Heat Removal (DHR) loss event. Additionally, we have analyzed our procedures for adequacy of safe-guarding against loss of redundancy and diversity of DHR capability and adequacy of responding to DHR loss events.
As a result of these reviews and analysis the following procedure changes have been initiated.
- 1) Operating Procedure 1104-4.
" Decay Heat Removal System" will be modified to provide additional administrative control over the position of Dil-V6A/B (Henctor theilding Sump Isolation Vavles). During cold shutdown and refueling shutdown conditions DH-V6A/B (except during testing) will be tagged closed with their breakers open to prevent inadvertent opening and potential draining of the Borated Water Storage Tank to the Reactor Building sump.
- 2) Maintenanco Procedure 1401-4.4.
" Removal and Replacement of Manway and Inspection Covers of the Once Through Steam Generator" will be modified to include the need to evaluate the DHR capabilities of other plant systems prior to removing any manways or inspection covers (on the primary or secondary side) from the OTSG's. This evaluation will consider the value of decay heat generation in the core, the Reactor Coolant System heatup rate if DHR is lost, redundancy requirements of the DHR trains, and alternate DHR schemes should the DHR Systems become inoperable.
These procedures will be modified by July 31, 1980.
The daily logs, weekly and monthly surveillances monitor the performance l
capabilitics of the DHR systems. Discrepancies detected by these surveillances THIS DOCUMENT CONTAINS o\\
ON POOR QUALITY PAGES hg % I 8007080 Metropot: tan Ed. son Company is a Member of the General Pubhc Utilities System s
j
nr 15 II. Grier TLL 315 J
V are corrected by means of the Corrective Maintenance Program. This combination is adequate to guard against DilR degradation and assess the DHR adequacy.
Sincerely.
l signed J. G. Herbeirt i.
J. G. Herbein 1
Vice President w -I
.I(:ll: DGM : 1ma At I achment cc:
1)i rec t o r Division of Operations Inspection NitC Office of Inspection and Enforcement Wash i ny,t on, 1). C.
20555
.l.
T. Collins 15. J. Snyder
- 11. Silver i
6 D. Dllanni I
I I
i, I
I
7
')
I TLL 315
. 4.
METROPOLITAN EI)lSON COMPANY
.lERSEY CENTRAL POWER AND 1.lGitT COMPANY AND PENN:M*l.VANI A El.ht'I'l:ll: G ell'ANY TiiHER Mll.E ISLAND NLICI.KAR STATION, UNIT I Operating 1.icense No. DPR-50 Docket No. 50-289 Thin letter is submitted in support of the Nuclear Regulatory Commissien request concerning the May 7, 1980 letter transmlLLing IE 15u11cti 80-12.
The responses to i t ems 7a inni h of the suh.]cet letter are attached.
Further, all statements cont ained in thene responses have been revitwed and all such statements made and matLers set forth therein are true and correct to the best of my knowle'ec, information and hellef.
t I
i-s NY.
a Vlec President i
i i
Sworn and subscribed to me this day of 1980.
'i 15Y....
Notary Public f
a r