ML20133Q127

SER Re Generic Ltr 83-28,Item 1.1 Post-Trip Review Program Description & Procedure. Util 831104 Response to Generic Ltr 83-28 Does Not Meet Guidelines for post-trip Review. Acceptable Responses Required

ML20133Q127
Person / Time
Site:	Crystal River
Issue date:	10/24/1985
From:	NRC
To:
Shared Package
ML20133Q113	List: ML20133Q112 ML20133Q127
References
GL-83-28, NUDOCS 8511010398
Download: ML20133Q127 (5)

Text

/

1 Enclosure 1 SAFETY EVALUATION REPORT FOR GENERIC LEllER 83-28, ITEM 1.1 - POST-TRIP REVIEW (PROGRAM DESCRIPTION AhD FROCEDURE) .

CRYSTAL RIVER NUCLEAR PLANT, UNIT 3 DOCKET h0.: 50-302 I. INTRODUCTION On February 25, 1983, both of the scram circuit breakers at Unit 1 of the Salem Nuclear Power Plant failed to open upon an automatic reactor trip signal from the reactor prot'ection system. This incident occurred during the plant start-up and the reactor was tripped manually by the operator about 30 seconds after the initiation of the automatic trip signal. The failure of the circuit breakers has been determined to be related to the sticking of the under voltage trip attachment. Prior to this incident, on February 22, 1983, at Unit 1 of the Salem Nuclear Pcwer Plant, an automatic trip signal was generated based on steam generator low-low level during plant start-up. In .

this case, the reactor was tripped manually by the operator almost coincidentally with the automatic trip. Following these incidents, on February 28, 1983, the NRC Executive Director for Operations (EDO), directed the staff to investigate and report on the generic implications of these occurrences at Unit 1 of the Salem Nuclear Power Plant. The results of the staff's inquiry into the generic implications of the Salem unit incidents are reported in NUREG-1000, " Generic Implications of ATWS Events at the Salem Nuclear Power Plant." As a result of this investigation, the Comission (NRC) requested (by Generic Letter 83-28 dated July 8, 1983) all licensees of operating reactors, applicants for an operating license, and holders of construction permits to respond to certain generic concerns. These concerns are categorized into four a'reas: (1) Post-Trip Review, (2) Equipment Classification and Vendor Interface, (3) Post-Maintenance Testing, and (4) Reactor Trip System Reliability Improvements.

The first action item, Post-Trip Review, consists of Action Iteni 1.1,

" Program Description and Procedure" and Action Item 1.2. " Data and Information Capability." This safety evaluation report (SER) addresses Acticn Item 1.1 only.

8511010398 851024 PDR ADOCK 05000302 P PDR

e i

2 II. REVIEW GUIDELINES The following review guidelines were developed after initial evaluation of various utility responses to item 1.1 of Generic Letter 83-28 and incorporate the best. features of these sLbmittals. As such, these review guidelines in effect represent a " good practices" approach to post-trip review. We have reviewed the licensee's response to Item 1.1 against these guidelines:

t

' The licensee or applicant should have systematic safety assessment A.

procedures established that will ensure that the'following restart criteria are met before restart is authorized.

The post-trip review team has determined the root cause and I sequence of events resulting in the plant trip.

Near term corrective actions have been taken to remedy the cause of the trip.

The post-trip review team has performed an analysis and determined that the major safety systems responded to the event within specified limits of the primary system parameters.

The post-trip review has not resulted in the discovery of a potential safety concern (e.g., the root cause of the event occurs with a frequency significantly larger than expected).

If any of the above restart criteria are not met, then an independent assessment of the event is performed by the Plant Operations Review Committee (PORC), or another designated group with similar authority and experience.

B. The responsibilities and authorities of the personnel who will perform the review and analysis should be well defined.

3 The post-trip review team leader should be a member of plant management at the shift supervisor level or above and should hold or should have held an SR0 license on the plant. The team leader

~

should be charged with overall responsibility for directing the post-trip review, including data gathering and data assessment and he/she should have the necessary authority to obtain all personnel and data needed for the post-trip review.

k A second person on the review team should be an STA or should hold a relevant engineering degree with special. transient analysis training.

• I The team leader and the STA (Engineer) should be responsibie.to concur on a decision /recomendation to restart the piant. A nonconcurrence from either of these persons should be sufficient to prevent restart until the trip has been reviewed by the PORC or equivalent organization.

C. The licensee or applicant should indicate that the plant response to the trip event will be evaluated and a determination made as to whether the plant response was within acceptable limits. The evaluation shculd include:

A verification of the proper operation of plant systems and equipment by comparison of the pertinent data obtained during the post-trip review to the applicable data provided in the FSAR.

An analysis of the sequence of events to verify the proper functioning of safety related and other important equipment. Where possible, comparisons with previous similar events should be made.

D. The licensee or applicant should have procedures to ensure that all physical evidence necessary for an independent assessment is preserved.

1

\

4 E. Each licensee or applicant should provide in its submittal, copies of j the plant procedures which contain the information required in Items A through D. As a minimum, these should include the following:

The criteria for determining the acceptability of restart The qualifications, responsibilities and authorities of key personnel involved in the post-trip review process s

The methods and criteria for determining whether the plant variables and system responses were within the limits as described in the FSAR The criteria for determining the need for an independent review.  :

III. EVALUATION AND CONCLUSION

. By letter dated November 4, 1983, the licensee of Crystal River Nuclear Plant, Unit 3, provided information regarding its Post-Trip Review Program and Procedures. We have evaluated the licensee's program and procedures against the review guidelines developed as described in Section II. A brief description of the licensee's response and the staff's evaluation of the response against each of the review guidelines is provided below:

A. The licensee has established the criteria for determining the acceptability of restart. Based on our review, we find that the

licensee's criteria for determining the acceptability of restart conform with the guidelines as described in the above Section II.A and, therefore, are acceptable.

1

5 B. The qualifications, responsibilities and authorities of the personnel who will authorize the restart and/or perform the post-trip review and analysis have been clearly defined. We have reviewed the licensee's chain of comand for responsibility for post-trip review and evaluation, and find it acceptable.

C. The licensee has addressed the methods and criteria for comparing the event information with known or expected plant behavior. Based on our

' review, we find them to be acceptable.

D. The licensee has not provided the criteria for determining the need for independent assessment of an event. We recommend that, if any of the review guidelines (as stat.ed in Section II.A of this SEP.) are not met, ,

an independent assessment of the event be performed by the PORC or a group with similar authority and experience. However, the licensee has established procedures to ensure that all physical evidence necessary for an independent assessment is preserved.

E. With regard to a systematic safety assessment procedure for post-trip review, the licensee referred to the existing process which is used to conduct restart evalurtions and is documented in the Florida Power Corporation Operations Section Implementation Manual,Section IV, Paragraph H, " Documenting Reactor Trip, Recovery, and Plant Shutdown."

We have reviewed this document and we recomend that it be revised to incorporate criteria for independent assessment.

Acceptable responses to the above noted deficiencies are required before we can complete our aview of the licensee's Post-Trip Review Program and l Procedures for Crystal River Unit 3. We will review these respoilses when received and report our finding in a supplement to this SER.

l l

l I