ML20336A198

LTR-20-0429 Daniel Shea, E-mail AP1000

ML20336A198
Person / Time
Site:	Vogtle
Issue date:	11/25/2020
From:	Shea D Daniel J. Shea, P.C.
To:	Kristine Svinicki NRC/Chairman
Shared Package
ML20336A199	List: ML20336A198
References
LTR-20-0429
Download: ML20336A198 (10)

Text

CHAIRMAN Resource From: DanShea <djs7500@aol.com>

Sent: Wednesday, November 25, 2020 8:39 AM To: CHAIRMAN Resource

Subject:

[External_Sender] AP1000 Attachments: SouthernNuke2Final.pdf

Dear Chairman Svinicki:

The attached letter to Southern Nuclear has not received a response. It has been review by retired executives of NUS Corporation and found to raise significant issues. Two are: Operator training design has been moved to DOE which disconnects it from the integrated human factors engineering (HFE) methodology employed by Brookhaven National Labs in the combined license for the AP1000 units Vogtle 3 and 4. The best I can determine is that training design under INPO continues to rely on job task analysis (JTA) from current operators instead of the task allocation methodology of Brookhaven. Why is Brookhaven not involved in the critical matter of operator job design and training curriculum design for the AP1000. This is an issue that resonates with the Boeing 737 MAX fiasco. With the new AP1000, you don't ask operators what their job is, you tell them what it is based on the plant design, the engineered safeguards setup, and the functional task allocation.. Also, the Broohhaven methodology deals with the real time task overload that was so apparent at TMI. Remember, the operators had to get keys to turn off the emergency coolant injection system that had correctly auto initiated. In effect, the brains of the operators over-rode the brains of the plant (i.e. its engineered safeguards designed to maintain reactor integrity for 30 minutes with no operator intervention).

The next issue is Westinghouse statement that the AP1000 pressurizer is 40% larger than comparably sized existing units

-- which would include Vogtle 1 and 2. Pressurizer size is a critical design consideration in the capacity of a PWR primary system to absorb the shock of a loss of load from 100% power. Granted, TMI was a B&W variant with once through steam generators that made the intrinsic heat sink of the B&W units inferior to the Westinghouse design. Westinghouse made this design decision but doesn't tell us why this increased pressurizer volume was necessary in light of TMI. What Tech Spec does this implicate?

Respectfully,

/s/ Daniel J. Shea, J.D.

Daniel J. Shea, P.C.

(832) 6373612 ALSO ADMITTED IN MA AND MY CONFIDENTIALITY STATEMENT This message is sent by a law firm and may contain information that is privileged or confidential. If you received this transmission in error, please notify the sender by reply e-mail and delete the message and any attachments.

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Proper operator reaction to challenges requires sufficient understanding of the plant design and its dynamic response to upset conditions, to diagnose the problem, to recognize when the plant safety systems are functioning effectively, and, in situations where they are not, to take additional corrective actions, including utilization of all available plant systems, to minimize the consequences. Attendant to these functions is assurance at all times that the status of plant systems is known and that the systems are in their required configuration.

The complementary goals of reducing the rate of challenges, and maximizing the response to challenges can be achieved through a vigorous commitment to improve the various elements of what can be thought of as an operations matrix for normal and emergency operations. 

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